This has happened to me when I was bowling a ton of games each week 50+ with a 16lb ball. I gave my wrist some rest. Also, I dropped from a 16lb ball down to a 15lb ball. Now, I haven't had the problem. I cup my wrist a lot so this was a problem I'm glad is now solved.
--------------------
I want to have a 220+ average like everybody else around here, so give me fresh oil.