We use the USB recording function on a QU32 to record sermon audio at my church. Several weeks ago the QU32 stopped recognizing the USB devices I had been using. I tried a brand new USB and it recognized it. However, I am noticing some glitches in the recordings. The glitches are just for a second. Any ideas on what is causing the issue and whether it can be fixed? Our QU32 is only 4 years old. Thank you!