TV Box stops cable signal and goes to an Xfiniti advertising screen after 4 hours

Ok, as stated above TV Box stops cable signal and goes to an Xfiniti advertising screen after 4 hours.  I have wasted multiple times on chat with tech support.  I have wasted 8 - 8 1/2 minutes on 5 separate calls to tech service, just to get past the completely UNHELPFUL AI chat bot that wants me to "Begin troubleshooting".  That is great, but resetting my box is most certainly NOT going to fix this issue.  I have been a customer for approximately 20 years and I AM familiar with ALL of the basic resetting procedures, including settings in the menu.  Now tech did find an error in my box and suggested that I replace it.  Now I have a new wireless box (my home is wired and I could not get a wired box, but that is a completely different rant...) and that wireless box does exactly as the original one does.  Now would someone ACTUALLY LISTEN TO ME.   This is NOT a power saver setting.  This is NOT parental controls.  This is NOT a chosen screen saver.  This is Xfiniti removing the the option of the box continuing to show the signal that I pay for each month.  I want MY cable signal to be on my tv 24 hours a day, 7 days a week, 365 days a year.  My cable box stopping and asking me "are you still there" and then decided to stop the signal to my tv is NOT ok at all.  I have personal issues that are, quite frankly, none of your business.  But this interruption of my services is causing me issues. This is NOT streaming, where a program ends and the screen saver comes.  This is the signal that I pay for just stopping on its own accord.  I need this corrected.  Each tech along the way tried to sell me a freaking cell phone and upgrade my service.  Why, oh why would I trust you with anything else if you cant get delivering what I pay for to my home?  The last tech I spoke with on the phone referred me to level 2 and opened a case.  They were to get back to me in 7-10 days.  That was 16 days ago... So again, failure to perform by Xfiniti.  I did call back in to see why I did not receive a call, the tech was very polite, very nice, and again, lied to me and said that my issue was resolved... Then 4 hours later... advertising for Xfiniti on my screen instead of the signal that I pay for.  I need this resolved.  Failure to keep the signal on my tv is both a theft of service for me and a breach of contract by Xfiniti.  I pay for that signal, without timers, without screensavers that are non-user controlled and I am not receiving what I pay for each month.  Please resolve this.