My 6400M running software version 2.133 crashed this evening while running a 40 meter SSB net. I had to switch to the Icom IC-7300 in order to complete the net. I consider this to be a major software bug. I know that at least 10 other 6400M owners are experiencing the same problem and I know that Tim is aware of the problem and has submitted a problem report. I would hope that this would be a priority fix. It is embarrassing to be in the middle of a QSO or Net and have your radio quit working. This has happened before while not touching any controls. This is in so many ways a great radio, but this problem is unacceptable. So until this problem is fixed I will have to run the net on my IC-7300.