Seems like sort of a bug with a clear pattern.
Recently we played 5v5 and one of our teammates got disconnected (internet provider issues).
10 seconds later he reconnected, but our match suddenly stopped and we were all kicked out.
This has happened three times already. I'm on paid plan.
Hey, I wrote up a detailed bug explanation here on the server crashes: https://popflash.site/forum/97390/a-note-on-cs-2-server-crashes
If you want to discuss it, hop in our Discord and I'm happy to have a chat about them. Cheers.