Hmm, you could try a hard reset, but I can't guarentee that it will fix the problem as I am having it too and I did a hard reset right after the Froyo update. If you do try a hard reset, you will lose all your data, have to reinstall all of your apps and setup all your settings again. You can get a backup utility to save the important stuff (MyBackupPro works great, and works on non-rooted phones).