From Mr. Hardy:
We did get some recent versions back that were reported to have issues, and we tested down to -40C with these specific units. We did find an issue that was fixed with v5.5-b9, but we haven't seen any other problems in our lab temperature wise.
If you are seeing problems, can you please contact me (firstname.lastname@example.org)? If we can get some of these units back that fail when the temperature drops, we can investigate and see what's going on.
So much for their fix :-\
For the record I have 800 devices and havent seen this problem, probably hit -15f the last two nights.... All set to 20db power.
But on the heels of the tough cable fiasco I would not welcome another catastrophe like this........