I use SP-CMC-8 mics > SP-SBSP1 battery box > Edirol R05.
i had this intermittent dropout problem back in December and contacted the dealer to help troubleshoot. dealer says "change the battery in the battery box". I am sure that is not the issue here, but I did anyway and, of course, the problem was gone. I have recorded more than 40 shows, changing the battery box 9v frequently (including yesterday I used a brand new battery). I am attaching a screenshot of the waveform as well as a sample of the sound of the dropouts.
The problem seems to happen a lot within in a few minutes, and then won't happen again for an hour or more.
Based on this info, is there a way to tell if I have a faulty battery box or if I need new/repaired mics?