YES! I'm on my 2nd SR, since release for same reason.
My first Skyrocket began repeatedly restarting, a few days after purchase. I thought I had the problem solved, after attributing the issue to an extra 16gb micro sd card, I took from my t-mobile Galaxy S 4G. But now my new Skyrocket, less than a week old, began the same **** 2 days ago - ALSO, after installing an extra 4gb card i had. WTF? The screen suddenly flashes white and the phone starts a continual process of restarting, until I'm able to get it to factory reset.