German Pinscher

I have a GP that is about a year and a half old (was a stray dog that wondered into my buddies firehouse, and now I have him) and have had him since Thanks Giving. He is a good puppy, smart, cute little rascal.
But one thing that has caught my attention, is that when he is out playing and running around at his quick little spazoid pace for several minutes... all of a sudden he just looses his balance/staggers/looks a little loopy/almost as if somebody bopped him on the head with a wiffle-ball bat. Then after about 10-15 seconds he returns back to normal.

I don't think it is a stroke episode, but almost like an epilepsy episode. Any ideas? Thank you!
David