The official servers are frequently crashing. Not much they can do at the moment. Bobik said to expect a stability patch potentially at the end of this week. I believe part of the patch today was towards that. Bobik said this on IRC:
[11:03] <@Bobik> well, we will make a mini patch today
[11:03] <@Bobik> that should help us to gather some additional info on these crashes
[11:03] <@Bobik> and hopefully will be able to fix more by the end of week
[11:04] <@Bobik> there is nothing instant we can do with that, unfortunately
As frustrating as the consistent crashes are, it's still an alpha at the end of the day. It'll get better as we go along. There is someone booting the servers back up manually, but they've been a little slow (not sure if it's even someone dedicated to it or just someone from the team).