Wirelessly posted
Keyboard and button response problems can be cause by moisture exposure. It may be coincidence that you noticed this at the same time as the OS upgrade.
Be aware that a sweaty pocket, foggy shower room, etc have been reported to cause problems.
If this is a possibility in your case, you need to remove the battery now, and let the device dry. See the article at
http://blackberryfaq.com/index.php/G...ckBerry_Wet%3F.