Yes, I had to reset the Zigbee Network Channel when I swapped the Zigbee antenna.
I just tried the zigbee counter tool and it doesn't skip a beat. Great troubleshoting tool by the way. What is strange is that we also periodically have trouble controlling sat box. For example, fast forwarding over the commercials and then can't execute playback. Then it will start working fine again. It seems to be out of the blue. I have tried alternate T2-C's too thinking it could be remote related. Same result. I'll keep fiddling with it and let you know my findings. Never had this issue with 433. Nothing in the environment is new either. I have been doing this a while and I think I have all my bases covered. I'll keep trying.