Hi there - I recently had an odd experience with an R-07 that I can't get my head around, and I'm hoping this might ring a bell with someone else in this thread.
I purchased this unit a little while back from another TS-er, who even included a mini-SD card with the last show they had recorded on it. Using some spare room on that same card (a Samsung something or other... sorry, not at home right now), I ran a few field tests at home, using a pair of CA mics (I forget which model, had 'em for years), and determined that everything was working fine. Shortly after that, I purchased a set of AT-853 mics w/4.7 mod, from another TS-er, and ran a couple similar test - again, no problem.
I recently recorded a show where I decided go go semi-stealth, mostly for convenience, using the CA mics, since I never got around to getting clips for the AT-853s. The result was a stellar recording. The other night, I recorded an acoustic set in a little cafe, and ran open, using the AT 853s on a short stand, and a different mini-SD card (SanDisk Class 10 32GB). the result was something that resembles a cassette recording riddled with dropouts - not intermittent, but very evenly spaced throughout the recording.
I can't imagine that the SanDisk card is the cause of the issue, but would that cause something like what I've described? In all my years of recording, this is a new one on me. Any ideas? Thanks for any insights, J.