I have had similar issues....mainly in the shower....heat maybe???? I certainly know form what I've read that you are not at all alone!
Currently grateful that it doesn't happen in the supermarket or anywhere like that!!!
Hope you find a solution!
Neuro says he'd "bet on me having MS"
IF YOU CAN'T SEE THE LIGHT AT THE END OF THE TUNNEL...
GO DOWN AND LIGHT THE BLOODY THING!!!