Client keeps rejecting server

Hi! I have Linux server 2.4.13 and Windows client 2.4.11 on Windows 10 (up to date). There is no newer version available. Server is installed in box with latest OpenMediaVault 5 (up to date). Not in Docker, because in docker it was failing to run more then a week. Docker container kept stoping after first backup. I have this problem every few days, but in meantime backups are created as usual. Each time I have to uninstall client, generate client from WebUI and install fresh from generated package. It is very frustrating. Can anybody help me with this in any way or had this problem?

I have noticed, that Urbackup sends “Error sending server signature to client” to the console, when started manually.