So I have 5 Tuya repeaters, based on the recommendation of @aaiyar . For the most part they are working great, however I have 1 that kept falling off(using generic repeater driver w/ presence check). I've tried re-pairing it to no avail. As it turns out I've installed about 5 wall outlets with built in USB charging, and the repeater that kept falling off was powered via the outlet's USB A port via being directly inserted in the outlet's USB port. Chasing this theory that the interference was being caused by the outlet itself, I added a 3 foot cable to distance the Tuya repeater from the outlet's circuitry, still no joy. Next step was to move the repeater to another regular outlet without built in USB ports, this time using an assumed "high quality" Blackberry tiny charger block(the squarish black ones) to power the repeater versus using the power from the outlet with integrated USB charging ports. So the repeater has not fallen off in a week, when before it was every day or 2. The new location for the repeater is less than 5 foot from its original location.
So for you engineer types out there, is this actually possible that a badly designed charger circuit could interfere with Zigbee?