Audi TT Stronic
Try to get a photo with your phone of the blue screen that comes up when it happens.
Have you seen how quickly a BSOD flashes up ? lol... he just needs to disable automatic reboot upon crash, then he can take all the time he likes to read it (or just check the event logs).. and while you are at it enable memory dumps, you can analyze them to determine what the machine considers caused the crash.. if it's random then it will probably be hardware related.
Any Bugcheck code will be logged in the event logs so check there. You could also leave it running in safe mode to see if it still hapoens.
This.