I have the same problem. Sometimes it happens during intercourse and other times it will happen after. I agree it is very distracting.
Things ruled out- TIA's, Lyme, Lupus, Crones, Narcolepsy, CFS, Fibro, Parkinson's, arthritis, and brain tumors.
Still nobody has answers.
Started my journey 1/06
When everything's coming your way, you're in the wrong lane.