Quite a few G300s have bricked spontaneously even without running CM10.2/3.4 kernel etc.
But in many cases people don't know what eMMC they had.
There's a suspicion that they may have been mostly or all Hynix eMMC based.
The suspicion is that Hynix eMMC based G300s are inherently at risk of bricking.
Specific versions (now removed) of CM10.2/3.4 kernel may have accelerated this but nobody really knows.
The current CM 10.2/3.4 kernel is no more risky on Hynix based G300s than anything else as far as I know.
But the hypothesis remains that the Hynix G300s may be living on borrowed time.
Edited by dalyer, 22 November 2013 - 11:08 PM.