Shuts Off for a Few Seconds...then Restarts

[GLASEM]

Our 2006 NA Mini is doing something strange
Did this in the spring.......went away and is now coming back every so often without
warning
You'll be driving along......and suddenly the car shuts off for a few seconds.....then comes back on........you see the tach zero.......radio goes off......gas and temperature gages zero.........then everything comes back on.
Mini is running great.......then all of a sudden this occurs
Any ideas???