What version of 3.7 did you upgrade to?
(See Options->About on BlackBerry)
I think it's time to install a different operating system.
I bet it will fix your proboems.
This is because there are so many different versions of 3.7. SOme of them are buggy. If you want the best version of 3.7, I highly recommend Cingular's 184.108.40.206 which is newest (115 is bigger than 37 and 41): https://www.blackberry.com/SoftwareD...ient=Rc4cZBaBN
Select the 7280 device. The 7230/7280 software is the same.
If you have always been interested in trying instant messaging (VeriChat MSN/ICQ/AIM), it is time to upgrade to BlackBerryOS 4 http://www.blackberryforums.com/viewtopic.php?t=1995