I've been suffering from this problem for as long as I've been playing the game but it's only recently that it's become more frequent (and grated on my nerves more).
Randomly during gameplay, my game will freeze then (Not Responding). I could just be standing around Haven, my Guild Hall or in a dungeon. "Java.exe *32" won't kill with Windows Task Manager and Steam won't let me run another game app, so I have to restart. If I log off then back on, the game will crash at -exactly- the same time. If I kill Steam then reopen it, it recognises the dead client as one in-session so it still says "Failed to open app" because the game's still running.
I've uninstalled SK, uninstalled Java, reinstalled Java, reinstalled SK and opened ports on my Firewall but, no dice. I've mailed OOO about this before but I just got told to read the FAQ on the Spiral Knights Wiki for solutions, but they were just telling me to do what I'd already done and didn't work.
I'm kind of at my wits-end, I'm getting tired of restarting my laptop because of this.
mind if i ask what your pc component? (windows'processor'memory and graphic card) go to start and write dxdiag in search box
and btw sk have been lag lately when rose regalia promo come~