Richtbmw

I have a 2006 msport 5 series 525auto6 and drives and pulls perfect, however after 30 mins or so when giving a little power the electrics go crazy.. I drive resets, diles going mad electrics going on and off, it comes up transmission fault then battery fault, abs, lights, and battery check terminals, I turn it of and on drives fine again.. its had a new battery , glow plugs and again drives fine .. please help