Appears X1 DVR box is killing our smart tv's!

Need help and need it ASAP please!  I want an Experienced technician to come visit asap. 

Couple months ago our older Sharp 65" smart tv (bought in 2015 for $900+) suddenly began turning off and back on by itself.  Then got to where it wouldn't turn on at all. Yes I did all the updates with the tv and Xfinity box itself, reboots, checked CEC settings to Off, unplugged the tv- held down power button for like 30 sec-plugged back in...still nothing.  Ultimately took that Sharp to a local recycling event as it appeared the mother board was fried (my best guess)- which can be expensive to replace compared to age of TV and lower prices on new TV's.

In the interim, moved a Vizio 55" tv from spare BR to living room for temp replacement.  The 55" worked perfectly for a month or so, but finally got a new 65" Vizio smart tv 2 weeks ago, moved the 55" back to BR and installed the new 65 in LR.  This new 65" worked fine for literally 2 weeks, then the EXACT same thing happened!  First it suddenly began turning off by itself after a few minutes...as before, I did all kinds of checking this, that, settings, plugs etc etc on and on....ultimately this brand new 65" died as well.  It will Not power on period- I can see the LED light for like 2 secs indicating it's trying to turn on but then nothing.  Oddly can still hear audio though through our sound system which is connected to same X1 box.  

Two 65" smart tv's now with fried power.  Thankfully, Vizio is sending a brand new replacement tv.  However, I'm not wanting to connect it to Xfinity now due to what's happened.  I need a technician to come out and troubleshoot all this, bring a new DVR box or whatever new is needed and get this resolved.  IMO, this HAS TO be related to DVR box or whatever else from Xfinity for 2 tv's to get fried with the exact same symptoms! It doesn't make sense to me how the heck this could even happen, but it's 110% true and needs resolution.  I have seen other comments from others that had exact same problem but no idea in end how their cases turned out.