Default [Q] i9505 Restarting randomly after May 16 update

I rooted my i9505 when it was 4.3, but when the 4.4.2 update came out, I lost the root, and I left this way, unrooted...

But last friday my phone asked me to make a new software update, and I made it, it says now that it's still with 4.4.2, but the kernel and the android are from May 16...

And after this update, my phone is restarting randomly, I alreadly cleared the cache, no difference, still restarting about 5 times a day...


Other thing I noticed, is that I had the phone to ask the pattern, only 30 secs after I lock the screen, but now, after the update, no matter if I choose 5sec or 5 mins, it'll ask the pattern right after I lock the screen... (and no, the 'lock instantly with power button' is not marked)


Is anyone having the same problem? Does anyone know how to fix?