Kdc-mp235.system works fine( am,...

kdc-mp235.system works fine( am,fm,cd,allcontrols) for 20-40 minutes.Then shuts off complety if I press reset soon after it will turn back on but all setting lost ( balance, fader,stations ect) and work fine again (20-40mins). IF I'velet it go overnite I have to unhook harnass & fuse ( on stereo back) reconnect and it will work fine again (no presets & 20-40 mins) I've rewired all speakers and powders grounds. I've even tried running powder directly from battery to check truck wireing and same thing happens.
going nuts lol
THANKS
CAM