Power bump

[Cragar111]

I bought my daughter a 2004 Volvo S60 For getting back and forth to school and we’ve discovered that when it is driven for 45 minutes or so there’s an electric power bump somewhere in the system and error messages are displayed in the information center like the driver’s rear door is open along with the interior lights coming on and the cruise will cancel. I can reset it by stopping and restarting the engine but once it has warmed up to this behavior it continues. Does anybody have any idea why it’s doing this or how I can fix it?