I expect there are lots of us who just live with the issue(s). I have an iPhone 12 mini with iOS 15.3 (current). Issues were there with earlier versions of iOS. I have OPN S 1 aids with firmware 8.0 according to the ON app (version 2.5.0). Genie doesn’t show a firmware update for either the aids or my TV Adapter 3.0. My TV adapter is connected to the TV using the digital optical input (fiber). The optical output from the Adapter runs to a Sonos sound bar but I mute the sound bar if I’m watching TV by myself.
In my case, if the ON app is disconnected from one or both aids when streaming from the TV Adapter, the MFI control panel shows the same problem (either one or neither aid connected). If one aid is connected, the MFI control panel selection of a different source (program or TV Adapter) switches the single connected aid instead of both. The ON app does the same thing.
I have found that shutting down the phone (power off) and restarting it daily reduces but does not prevent the issue. If I have a disconnect, powering off the disconnected aid (easy as my aids are not rechargeable) and rebooting it usually, but not always, fixes the bluetooth connection to the iPhone as shown by either the MFI control or the ON app. Sometimes killing off the ON app and anything else that might use bluetooth and then restarting the ON app works. When all else fails, I also power off the phone and then restart it (the 12 is fairly quick compared to older phones).
I live in a town house that shares a single wall but there are LOTS of wifi signals around (an app called iStumbler running on an iMac Pro with macOS 12.2 shows 28 WiFi networks early this morning with about 1/2 in the 2.5 GHz band and the rest at 5 GHz. I typically have 14 devices connected to my 802.11ax (WiFi 6) router and most are WiFi as only 3 use ethernet to the router. Two iPhones, two iPads, two computers, a thermostat, three smoke/CO2 detectors, and so on use WiFi for a network connection. So there may be interference but I don’t seem to have interference if I use a ConnectClip (with current firmware) to connect my aids to my computer. I do have to use a BTD 800 bluetooth dongle (shows as an audio adapter) in the iMac Pro to make that connection reliable.
I have not tried using the TV adapter with my iPad to run ON with aids connected to the iPad rather than my iPhone so I guess I should try that to see if it works differently than my iPhone as Chuck has found.
Frustrating that Oticon and Apple don’t seem to be interested in fixing the problem(s). That said, we have had all sorts of issues with some Bluetooth connected instruments at work (and in the field) so my take is that Bluetooth is NOT yet a reliable method for instrument or device control. I certainly don’t know enough to decide who is at fault but I suspect both the Bluetooth chipsets and programming have too many bugs to work reliably in complicated environments.
Stuart