Noticed nothing like that after I rooted. I can say, and I often do, that all issues of this sort have in my limited experienced been traced to programs that don't work well together. Did you download and install any new programs either right before or right after obtaining root? Or do you have something running the background while using the market? I agree that root isn't causing this problem, but something is and I'm betting on new installs or background issues. Good luck.