Very informative, thanks everyone. I do hit a with quite a bit of topspin on both wings. It's clearly overuse, even though I don't put nearly as many hours on the court as I have before, there is at least one 'hitting lesson' everyday. I'd say I'm on court hitting/feeding an avg. of about 15-20 hrs a week; I've certainly done more in the past, but I'm guessing it's cumulative as well.
USPTA Pro, Santa Rosa Beach, FL