CNN and MSNBC channels not working properly

I see that others are also experiencing issues wiht CNN and MSNBC channels.  I have been experiencing the same issues - channel image breaks up, pixilates etc what ever you want to call it, but its unacceptable.  I escalated this issue to Comacast over a month ago, a tech come out and 'fixed' the problem which lasted for about 5 weeks and now the same thing is starting to happen again.  Comcast is charging me $70 for the last tech call visit to fix THEIR problem - what a cheek!  I am disputing this charge, since this is a fundamental Comcast/Xfinity problem that they need to fix and stop wasting the customers time, and making us go round in circles trying to fix this remotely and coming up with the same issues and still not fixing the problem. 

Its costing me a fortune each month for an exhorbitant charge and then I am still expected to pay for them to sort out THEIR problem - and meanwhile the customer suffers! 

I was told to wait an hour for the box to reset after a reboot.   I have lost count on the number of times that I have power cycled the system, unplugged the wall socket and refixed - tightly with a wrench! and still the same problem. 

This is going to be the last chance to fix this - and if still not fixed,  I will be cancelling my account and will be going elsewhere.