My 2005 4runner is having issues with the stereo cutting in and out. I think it may be a short somewhere but I'm not sure how to tell. When the stereo cuts out everything is still functional except the audio and volume button on the wheel and head unit. I've noticed it sometimes cuts out if I hit a small bump in the road, but not all the time. I have an amp, which runs to my factory speakers, and a sub installed. I work out of my car so I have to use a small (inexpensive) power conervter to power my laptop throughout the day. Does anyone have any suggestion? Any input is greatle appreciated.