I have a TCL 4K UHD (model# 49s405). It is working just fine but I can't seem to get it to connect to my router on a 40MHz channel on 5GHz for anything. For example, my router is set to channel 151 which is a 40Mhz wide channel, but the router shows it connected to only one of the 20MHz channels at 144Mbps. The TV works just fine but I would like to know why. I also tried an 80MHz wide channel and it does the same thing.