My 6700 has begun to lock up 4 or 5 times a day. I have to turn off the radio and restart it to bring things back. I have also experienced a few "stalls" where the radio would come back on its own. On one occusion, as I was sending someone their RST report on CW the radio stalled as a character was being sent. It remained sending the carrier for several seconds, at full power, before returning to a normal state (embarrassing). I have 18.104.22.168 installed, which I have been running long before this problem arose.