It's been a while since I last stepped foot in the xda forums as I've been happy with stock, however when kies pushed the 4.3 update to my Note 2 I've started having problems - my phone will not sleep. After 2 min timeout the display turns off and immediately turns itself on again. It then goes into a loop where it turns off and on again every second until I unlock it. This is playing havoc with my battery life (I only get about 6 hours from full charge now). I've tried disabling any setting that might cause this (like smart stay etc.), I downloaded wakelockdetector (doesn't detect anything), I've tested my sensors and sleep mode with #*0*# (sleep mode has the same problem here), and I've done multiple factory/hard resets (x5).
I want to go back to 4.1.2 because this problem only started happening with 4.3 except now I have a different problem - I can't get download mode to work so I can't flash any recovery/firmware. I get the download mode screen up via the usual 3-key method, however once I'm there it seems to disable my volume keys because they stop working. I can get into recovery mode without any problems and the volume keys work fine there, but once it loads up the download mode screen and prompts me to press vol up to start or vol down to cancel, no matter what I press nothing happens. I have to hold down the power key to reboot.
Does anyone have any idea why my Note 2 is so broken?
Would really appreciate some expert help here. Thanks in advance.
Other stuff I've tried: I've tried with and without my SDcard. I've tried formatting my SDcard. I've tried taking my battery out for 5 mins and then go straight to download mode, but still my vol keys won't work.
I got kies to do a firmware reinitialisation which downloaded 4.3 again and flashed my phone a second time but still the problem persists.