[T-Pak Addict]

I would get it code scanned.
It could be a number of things but could be a blocked injector to a dirty fuel filter...

Do yourself a favour and buy a Elm327 with a switch and get Forscan...
If when you are restarting its all ok again it may have not logged the code, so you may have to hook up you laptop with Elm327 while its happening to find out what code its displaying.