WOW. About three or four weeks ago my OTA channels disappeared, and my H3 did not recognize my OTA dongle. After the usual disconnects and connecting back, nothing changed. Didn't have much time to follow up til today, when I checked the USB cable and other things, everything in perfect work order but the OTA dongle not being recognized by the H3. Came here and found this thread describing my exact issue.
So, yes, H3 with single tuner OTA dongle, H711, all the usual suspects....
At least now I know the root of the issue.
So... wait for Dish to update the software and fix the issue, send a Dual Tuner to all of us, or buy one myself... as I understand those are our options. Right?