Every so often, more and more regular, I'll be doing something super trivial and bump my soft tissue in my fingers, hands...and it feels like someone took a floor hammer to it, like I've got a massive bruise, for about 10 to 15 seconds then it's gone. No bruise, no evidence of anything.

This can also happen in my wrist if I rotate it or bend it, again, randomly and not due to any extra exertion or stress.

Anyone got any ideas? Driving me crazy