Sprint is citing some issues with the Froyo update causing problems with data connectivity and SD card quirks. They are advising that a hard reset seems to clear up the problem (back up your data first), though it’s possible that OTA updates, if you haven’t received it yet, is being put on hold. The download is still available at Samsung’s site, but you might want to be careful with it. Definitely backup before doing anything. Fortunately, I have not had any issues myself, but a lot of people had, so the update will be pulled, retooled, and released again sometime, hopefully soon.