Sad face time. I've had numerous problems with my ZL - the mic cutting out, crackling quality on speakerphone, the proximity sensor being in the wrong place for left handed people.. but now, it's much worse.
My phone is randomly turning itself off. I am rooted and have CM running, but that doesn't seem to be the issue. It started a day or two after updating from CM10.2 to CM10.2.1, but I've downgraded to CM10.2 again and it's still happening. It was a complete wipe and reinstall - no luck. There doesn't seem to be any consistent cause for it.
The phone just switches off mid-use, and will only partially turn back on. It will either show the Sony logo, then die again. Or it will get halfway through booting the CM logo, and then switch off again, immediately to a black screen. It seems to boot back up again better if plugged in, but not always.
To be honest, I think this is a hardware fault and will have to go in for repair. The ZL never launched in the UK, so I think this is going to cause me even more problems. Sad face again.
Any help or advice appreciated, but I think my ZL is dying.