Is this a common issue with a quick fix or do I need to take it in?

I've done a bit of custom wiring already so hoping to avoid having to remove everything and revert to stock.

So, basically, only after being on the road for an hour, hour and a bit, the touchscreen and music die, then it reboots to the Mitsubishi Motors screen. It may flicker and do this 1 to 10 times before resuming music, and then may do it again within 2-5 minutes. Turning it off doesn't help, it'll still flicker and boot as if the car has just been started when it chooses to restart.

Anybody know where I can look? Although I'm assuming it just needs an entire new stereo/touchscreen.