Problem with backup process

Hello all,
I have Urbackup server version 2.4.12. The server is working properly, but often during backup, the process freezes while downloading a list of files “urbackup/filelist.ub”. This status does not change, then I need to manually stop the backup and then start a new one manually. Recently I saw that when the backup is frozen and when I save the configuration without changing it, the process goes to the next stages. Below is a log from this backup process.

Thanks in advance for any help.

06.05.20 15:35 DEBUG pdcsrv: Waiting for filelist
06.05.20 15:35 DEBUG pdcsrv: Connecting for filelist (async)…
06.05.20 15:38 WARNING Restarting shadow copy of Q:\ because it was started by this server
06.05.20 15:38 INFO Scanning for changed hard links on volume of “Q:”…
06.05.20 15:38 INFO Indexing of “DRERYK” done. 1 filesystem lookups 0 db lookups and 0 db updates
06.05.20 15:38 DEBUG pdcsrv: Doing backup without hashed transfer…
06.05.20 15:38 INFO pdcsrv: Loading file list…
06.05.20 15:40 DEBUG Loading “urbackup/filelist.ub”. 0% finished 0 bytes/1.66602 KB at 0 Bit/s
06.05.20 15:42 DEBUG Loading “urbackup/filelist.ub”. 0% finished 0 bytes/1.66602 KB at 0 Bit/s
06.05.20 15:44 DEBUG Loading “urbackup/filelist.ub”. 0% finished 0 bytes/1.66602 KB at 0 Bit/s
06.05.20 15:46 DEBUG Loading “urbackup/filelist.ub”. 0% finished 0 bytes/1.66602 KB at 0 Bit/s
06.05.20 15:48 DEBUG Loading “urbackup/filelist.ub”. 0% finished 0 bytes/1.66602 KB at 0 Bit/s
06.05.20 15:50 DEBUG Loading “urbackup/filelist.ub”. 0% finished 0 bytes/1.66602 KB at 0 Bit/s
06.05.20 15:52 DEBUG Loading “urbackup/filelist.ub”. 0% finished 0 bytes/1.66602 KB at 0 Bit/s
06.05.20 15:54 DEBUG Loading “urbackup/filelist.ub”. 0% finished 0 bytes/1.66602 KB at 0 Bit/s
06.05.20 15:56 DEBUG Loading “urbackup/filelist.ub”. 0% finished 0 bytes/1.66602 KB at 0 Bit/s
06.05.20 15:58 DEBUG Loading “urbackup/filelist.ub”. 0% finished 0 bytes/1.66602 KB at 0 Bit/s
06.05.20 16:00 DEBUG Loading “urbackup/filelist.ub”. 0% finished 0 bytes/1.66602 KB at 0 Bit/s
06.05.20 16:02 DEBUG Loading “urbackup/filelist.ub”. 0% finished 0 bytes/1.66602 KB at 0 Bit/s
06.05.20 16:04 DEBUG Loading “urbackup/filelist.ub”. 0% finished 0 bytes/1.66602 KB at 0 Bit/s
06.05.20 16:06 DEBUG Loading “urbackup/filelist.ub”. 0% finished 0 bytes/1.66602 KB at 0 Bit/s
06.05.20 16:08 DEBUG Loading “urbackup/filelist.ub”. 0% finished 0 bytes/1.66602 KB at 0 Bit/s
06.05.20 16:10 DEBUG Loading “urbackup/filelist.ub”. 0% finished 0 bytes/1.66602 KB at 0 Bit/s
06.05.20 16:12 INFO Waiting for file transfers…
06.05.20 16:12 DEBUG Loading file “s_dreryk_7.20.1.0_20200506T003305.7z”
06.05.20 16:13 DEBUG Loading “DRERYK/s_dreryk_7.20.1.0_20200506T003305.7z”. 33% finished 288.97 MB/872.213 MB at 40.4002 MBit/s
06.05.20 16:14 DEBUG Loading “DRERYK/s_dreryk_7.20.1.0_20200506T003305.7z”. 70% finished 615.299 MB/872.213 MB at 45.6234 MBit/s
06.05.20 16:15 DEBUG GT: Loaded file “s_dreryk_7.20.1.0_20200506T003305.7z”
06.05.20 16:15 DEBUG Loading file “s_rawdata_7.20.1.0_20200506T003857.7z”
06.05.20 16:15 DEBUG PT: Hashing file “s_dreryk_7.20.1.0_20200506T003305.7z”
06.05.20 16:15 DEBUG HT: Copying file: “/BACKUP/pdcsrv/200506-1535/DRERYK/s_dreryk_7.20.1.0_20200506T003305.7z” (id=5)
06.05.20 16:15 DEBUG HT: Renaming file to “/BACKUP/pdcsrv/200506-1535/DRERYK/s_dreryk_7.20.1.0_20200506T003305.7z”
06.05.20 16:16 DEBUG Loading “DRERYK/s_rawdata_7.20.1.0_20200506T003857.7z”. 6% finished 350.211 MB/5.21799 GB at 48.9619 MBit/s
06.05.20 16:17 DEBUG Loading “DRERYK/s_rawdata_7.20.1.0_20200506T003857.7z”. 12% finished 693.665 MB/5.21799 GB at 48.0128 MBit/s
06.05.20 16:18 DEBUG Loading “DRERYK/s_rawdata_7.20.1.0_20200506T003857.7z”. 19% finished 1.03315 GB/5.21799 GB at 50.9289 MBit/s
06.05.20 16:19 DEBUG Loading “DRERYK/s_rawdata_7.20.1.0_20200506T003857.7z”. 26% finished 1.38597 GB/5.21799 GB at 50.5084 MBit/s
06.05.20 16:20 DEBUG Loading “DRERYK/s_rawdata_7.20.1.0_20200506T003857.7z”. 33% finished 1.72473 GB/5.21799 GB at 48.497 MBit/s
06.05.20 16:21 DEBUG Loading “DRERYK/s_rawdata_7.20.1.0_20200506T003857.7z”. 39% finished 2.06305 GB/5.21799 GB at 48.4303 MBit/s
06.05.20 16:22 DEBUG Loading “DRERYK/s_rawdata_7.20.1.0_20200506T003857.7z”. 45% finished 2.39811 GB/5.21799 GB at 47.9679 MBit/s
06.05.20 16:23 DEBUG Loading “DRERYK/s_rawdata_7.20.1.0_20200506T003857.7z”. 52% finished 2.75456 GB/5.21799 GB at 51.0282 MBit/s
06.05.20 16:24 DEBUG Loading “DRERYK/s_rawdata_7.20.1.0_20200506T003857.7z”. 59% finished 3.09876 GB/5.21799 GB at 49.2759 MBit/s
06.05.20 16:25 DEBUG Loading “DRERYK/s_rawdata_7.20.1.0_20200506T003857.7z”. 66% finished 3.46736 GB/5.21799 GB at 52.7698 MBit/s
06.05.20 16:26 DEBUG Loading “DRERYK/s_rawdata_7.20.1.0_20200506T003857.7z”. 73% finished 3.83607 GB/5.21799 GB at 52.7846 MBit/s
06.05.20 16:27 DEBUG Loading “DRERYK/s_rawdata_7.20.1.0_20200506T003857.7z”. 80% finished 4.20511 GB/5.21799 GB at 52.8332 MBit/s
06.05.20 16:28 DEBUG Loading “DRERYK/s_rawdata_7.20.1.0_20200506T003857.7z”. 87% finished 4.57583 GB/5.21799 GB at 53.0732 MBit/s
06.05.20 16:29 DEBUG Loading “DRERYK/s_rawdata_7.20.1.0_20200506T003857.7z”. 94% finished 4.94619 GB/5.21799 GB at 53.0214 MBit/s
06.05.20 16:29 DEBUG GT: Loaded file “s_rawdata_7.20.1.0_20200506T003857.7z”
06.05.20 16:29 DEBUG Loading file “DRERYK” (metadata only)
06.05.20 16:29 DEBUG PT: Hashing file “s_rawdata_7.20.1.0_20200506T003857.7z”
06.05.20 16:29 INFO Waiting for file hashing and copying threads…
06.05.20 16:30 DEBUG HT: Copying file: “/BACKUP/pdcsrv/200506-1535/DRERYK/s_rawdata_7.20.1.0_20200506T003857.7z” (id=9)
06.05.20 16:30 DEBUG HT: Renaming file to “/BACKUP/pdcsrv/200506-1535/DRERYK/s_rawdata_7.20.1.0_20200506T003857.7z”
06.05.20 16:30 INFO Waiting for metadata download stream to finish
06.05.20 16:30 DEBUG Waiting for metadata download stream to finish (attempt 0, pdcsrv). 10s since last meta-data transfer. Forcefully shutting down after 2m 20s without transfer.
06.05.20 16:30 DEBUG Waiting for metadata download stream to finish (attempt 1, pdcsrv). 20s since last meta-data transfer. Forcefully shutting down after 2m 20s without transfer.
06.05.20 16:30 DEBUG Waiting for metadata download stream to finish (attempt 2, pdcsrv). 30s since last meta-data transfer. Forcefully shutting down after 2m 20s without transfer.
06.05.20 16:30 DEBUG Waiting for metadata download stream to finish (attempt 3, pdcsrv). 40s since last meta-data transfer. Forcefully shutting down after 2m 20s without transfer.
06.05.20 16:30 DEBUG Waiting for metadata download stream to finish (attempt 4, pdcsrv). 50s since last meta-data transfer. Forcefully shutting down after 2m 20s without transfer.
06.05.20 16:31 DEBUG Waiting for metadata download stream to finish (attempt 5, pdcsrv). 1m since last meta-data transfer. Forcefully shutting down after 2m 20s without transfer.
06.05.20 16:31 DEBUG Waiting for metadata download stream to finish (attempt 6, pdcsrv). 1m 10s since last meta-data transfer. Forcefully shutting down after 2m 20s without transfer.
06.05.20 16:31 DEBUG Waiting for metadata download stream to finish (attempt 7, pdcsrv). 1m 20s since last meta-data transfer. Forcefully shutting down after 2m 20s without transfer.
06.05.20 16:31 DEBUG Waiting for metadata download stream to finish (attempt 8, pdcsrv). 1m 30s since last meta-data transfer. Forcefully shutting down after 2m 20s without transfer.
06.05.20 16:31 DEBUG Waiting for metadata download stream to finish (attempt 9, pdcsrv). 1m 40s since last meta-data transfer. Forcefully shutting down after 2m 20s without transfer.
06.05.20 16:31 DEBUG Loading "urbackup/FILE_METADATA
06.05.20 16:31 INFO Writing new file list…
06.05.20 16:31 INFO All metadata was present
06.05.20 16:31 INFO Backup verification is enabled. Verifying file backup…
06.05.20 16:35 DEBUG Verified 11 files
06.05.20 16:35 INFO Backup verification ok
06.05.20 16:35 DEBUG Syncing file system…
06.05.20 16:35 DEBUG Creating symbolic links. -1
06.05.20 16:35 DEBUG Creating symbolic links. -2
06.05.20 16:35 DEBUG Symbolic links created.
06.05.20 16:35 INFO Transferred 6.06977 GB - Average speed: 16.8492 MBit/s
06.05.20 16:35 DEBUG Script does not exist urbackup/post_incr_filebackup
06.05.20 16:35 INFO Time taken for backing up client pdcsrv: 59m 26s
06.05.20 16:35 INFO Backup succeeded