Just to point out that until now - after having compcache enabled - I had 2 hard crashes with new KP49. I write here because I think it could be a particular use-case that triggers the lock. Both times it happened to me while mediaplayer was broadcasting via FM transmitter, and heavy swap activity caused by an incoming call locked the interface, triggered the vibrator until the phone once rebooted itself and the other one obliged me to take away the battery after more than a minute with the vibrator shaking...
Before I passed to KP49 with stock DSP profile, I had KP48 with a rather undervolted profile with some instabilities from time to time. At the time, using compcache was almost impossible, causing lock usually by SD file system corruption (see a pattern here?)
I decided to test KP49 some time ago and so far, very good, with very stable phone and seeminlgy almost same battery life of my old configuration.
Then I decided to enable compcache again, installed the swap enabler script and felt immediately that probably no more fiddling would be done since the 900 was almost perfect.
Unfortunately, since then those two hard crashes happened, both as described with a very similar pattern. If somebody gives me a clue, I can try to dig it more if it happens again.