can not change wifi channel or band

It seems that recently the xfinity app no longer allows one to manage/change the wifi broadast band or channel. Is this true? Of course it has been prevented for a while on the local network webpage (although you can see the settings to change they are greyed out).

What is the purpose of preventing someone leasing this equipment from making necessarty changes to maintain performance?

Using a wifi analyzer It appears that most xfinity products "prefer" channel 157 on a 5Ghz network. This renders that channel useless for the bandwidth I am paying for. And now I cannot move my wifi to an empty channel. Seems your algorithm needs some work. Further, even when I was able to change the channel / band that Xfinity (under the guise of managing the system) would merely put it back within an hour or two to channel 157. Can this setting be made available again for the renter and some level of effort be made to stop xfinity from resetting it or is this a way to advocate that folks stop renting your modem and fix this issue on their own?

Thanks in advance!

Jeff