Right after the latest update to 2.3.3 update I have had several issues come up.
The wifi hotspot feature is very slow to get going. The four menu buttons on the bottom of the screen for menu, home back and search no longer light up. It seems that once every few days I can no longer send text message and the internet access is gone until I reboot the phone and doesn't matter if I am connected to wifi or not. Some times is seems that the notification LED doesn't work.. This is off and on. Performance can be choppy at times and is it just me or did the signal strength get worse.. It seems like it keeps going from one bar to several (depending on where I am this can be 2 or all 4) .
I hope they release a hot patch soon..