30 min ban and -10 lp for client crash in champ selct

Pretty sure ban time is related to # of dodges, So if it was your 1st dodge its like 5min ban. Did you dodge a few games before that one?

I know I lagged out champ select the other day and got 5min and -3 lp

Depends on the situation, I think, Kraken.

I had no dodges and the same thing happened to me a few weeks ago when somehow a bug in the beta client was triggered and the game black screened after it transitioned from champ select to the loading screen for the game. I was forced to get back into the game via restarting the computer - which on my machine is not instantaneous. (Took way too long.) Apparently, some tilted players in the game reported me for being AFK - and faced the same situation as the above poster.