If you are able to identify the specific sequence that leads to these problems, it would be enormously helpful. Until we can re-produce the effect, we stand no chance of finding a fix for it. Thus far, none of either our internal or external beta testing team has yet observed the problem that has been flagged with the waterfall.
I too will continue to try. But like Alan said, it has not happened again. Trust me though, it was real. It was kind of unnerving.... I used the waterfall to tune to a station and while listening suddenly realized that the waterfall was apparently displaying some other portion of the spectrum. It was still "waterfalling" and I was still listening to the same audio. But the station I was still listening to was no longer anywhere I could find on the waterfall.... without any discernible interruption in the received audio.