I cracked my 3rd frame last night (2nd in one week) when my racquet slipped out of my hand. This is obviously getting a bit expensive. They're cracking completely through at 11-1 o'clock. I replace the overgrip every day and have great serves, just the slipping problem... It doesn't slip often, but when it does it's gone. I'm about 3 for 5 in the last few months. I thought about making a cord, like on a racquet ball racquet so it won't fly away as easily. Any solutions ???