I don't mean new leak. Its been around for a while, the last release of jelly bean. My phone was way faster back on gingerbread and battery life was actually acceptable.
As for the steps I've used to debug. I always clean install even deleting old slot and creating a different one. The camera has been crashing my phone every time I go into the gallery. It then corrupts the image. I'm also experiencing a weird over clocking issues. It over clocks for about 5 minutes then reverts back to 1200.
I did switch back to stock and its given me zero issues so far. Not the snappiest but still basically bug free.
Well I honestly don't know why or what is causing your camera/gallery issues... they have been the same since 1.0. I will say that if you're using no frills you have to go into the app, select settings and then select refresh frequencies or it will revert to stock values.
You could try backing up your photos to your comp or external sd then deleting the dcim folder then wipe cache and dalvik and then boot up. Maybe something got corrupted some where along the way...again I'm not sure. I haven't had that particular issue and no one else has complained of it. I hope you can figure it out.