This is a known problem with the CS:GO downloader (specifically and exclusively) that has come up a few times on this forum. One thread a few down the page that talks about it is this one: viewtopic.php?f=44&t=7311
. In my last post in that thread, I said:
The only time that I was able to reproduce this myself, it was on a 1-core VDS. I upgraded that VDS to 2 GB of RAM (without changing anything else) and it worked as it should, suggesting that it was a problem with memory in some way. Did you have low free memory when the reboot occurred?
If it occurs regardless of the memory situation, and it's reproducible, please open a support request, and we can try the latest version of Xen and latest GPLPV drivers. If those don't work, we can involve the author of the drivers.