Thanks Jon, I had already attempted a factory reset and moved a few extra range extenders to that area with the same result.
I ended up doing a bit of re-wiring so I could get a neutral wire into that switch box. So I no longer need the 2-wire setup.
I also cannot link a 2474 DWH, I am getting an error about 8% into the process, saying it cannot determine the device link address
Any advice?
I am using incandescent bulbs and have multiple RF devices close by (less than 4 feet)