Switching from cable to Xfinity wireless boxes for TV

Over the past few years I have had recurring issues with Xfinity TV.  Internet always works great.  Issue is always signal loss affecting live TV.  Picture freezes, goes to black screen, then comes back up, plays fine for 20 seconds and the loop continues.  Also unable to change channel, constant pop up message of "we cannot provide that channel now try again later."  If I can get around the constant pop up of error messages DVR program play fine.  And so does Youtube.  I have had many tech visits.  The issue is defintely not in the house.  Eventually after several days the TV issues are gone without explanation and I am back to normal.  But no one has ever been able to identify the problem and then finally correct it.  This happens every few weeks for a few days.  And sometimes just for a few hours.  Weather conditions play no part as to when the problems occur.  I am convinced that Xfinity is simply not capable of providing consistent TV via cable to my house.  I was determined to go to all wireless tv boxes since my internet always works great, but I just spoke to a tech who told me the main cable box still has to be hard wired.  Does anyone have any advice regarding simply getting live TV without constant problems?  I like Infinity TV when it is working and do not want to go to satellite unless that is the only option I have.