So far I've tried this on the p769 and metro, I don't know the inner-workings of the fix so try at your own risk .
1. Download Kuma's Persist.img here: https://mega.co.nz/#!8pt0xCqA!3-uV70...YNU0KDUqQRVVbo
2. Download and extract, if you haven't already, fastboot here: http://forum.xda-developers.com/show....php?t=2292828
3. Put the persist.img in the yours fastboot folder
4. Start fastboot option 1 and run the command : fastboot flash persist persist.img
Hopefully this will fix most, if not all of your ADB problems and crashes.