Ever since i updated to 10.5.1, after a while the computer freezes up completely and i get the message that i should do a forced restart. This happened about three times daily. I disconnected my bluetooth dongle and used my wired mouse for a while. The problem now seems to have gone. (I use a Kensington Bluetooth USB adapter, model 33348 and a Logitech V470 bluetooth mouse) There must be some bug. This never happened with 10.5.0 Is anyone else experiencing similar problems?