These things happened about a few months ago, on the 2 SLs that I manage to beat.

First: Right after I beat the Rabid Snarbolax with friends and started walking towards the elevator Spiral Knights just closed itself... I had no other windows operating besides SK at the time, however I logged back on and I was loaded into the SL, like I had been disconnected or something.

Second: Right after I beat the Ice Queen with friends and started walking towards the elevator Spiral Knights just closed itself again.... however this time it wouldn't let me log back on at all. Until 15 minutes later I was able to log back on but I was in the ready room instead of the shadow lair. Thx to one of the GMs I was able to get back inside. But is this a bug, or did I just disconnect at the same in both shadow lairs.

P.S. My computer never closes spiral knights if I have it open, but if I minimize it sometimes it just closes Spiral Knights all together.