I am having this same issue. One person above described it as being like a tape fast forwarding. I don’t know if this will help the developers, but based on my experience with digital audio, it seems like the sound is simultaneously playing back at two different sample rates. The correct sample rate yielding the proper sound and the incorrect rate yielding the chirping. I read above that some users have temporarily corrected the situation by changing the quality setting and changing it back. This reinforces my suspicion that it is related to audio sample rate. Another poster above asked what playback devices and I can tell you that I get the same behavior playing back on my Roku TV, my Win 7 PC and my Android phone. I’m quite certain that it’s not related to reception as I am basically right in the city and using a very good antenna. I almost never experience drop outs. I tried calling support but got a fast busy.