Genie Mini Drops MoCA connection once or twice an hour

[PSK-927]

I have an HR44/500 Genie DVR and one C61-500 Mini (wired). About every half an hour or so, it will drop connection and re-sync. After this happens, the live buffer is cleared and double-play is cancelled. I have tried a double reboot on both the DVR and the mini, power cycling on both, and Reset Defaults on the Mini, but the problem remains.
The main Genie DVR has no issues, good solid signal on all channels.

Any ideas?