I have just purchased this dongle for use with my Raspberry Pi4, as my Pi is in a metal case so needed an external dongle. I’m using it with two different 8bitdo controllers. I’ve stuck the dongle underneath my TV so that I can get line of sight and I’m sitting less than 3 metres away, but I’m getting major issues with input lag at this distance, and often inputs just won’t register at all, or catch up once I’ve moved slightly. Could I have a defective adapter? I’m running the adapter on a 0.3m USB extension cable and the Pi itself is behind the TV. I have disabled the onboard Bluetooth and WiFi so not sure what else could be causing interference apart from perhaps my wife and I’s mobile phones, but even with those off the issue is still there.
I should note that I have a USB 3.0 SSD drive hooked up to the Pi and have read things about USB 3.0 causing Bluetooth interference. Could this be the issue?