I've never had problems with BBWeather and have been using it for quite a while, so I have my doubts that it's that.
I did notice that shortly after we got the device set up, and it was working, my device was bouncing from 1X to 1XEV - but that's pretty normal for my device.
I'll check out the signal utility, but I may go with an easier approach - monitor it for a few more days, unplug the Airave and then monitor it again for a few days.