Why are some channels pausing, locking up, & freezing even though we have new box and remote, and have spent HOURS with technical support?

Because we were getting the error message "cannot connect to the Internet" when Channels were locking up (mostly TVLand and MEtv) ... but we don't have Comcast Internet ... we have Fios); I called Comcast technical support; woman said we needed new box ... didn't want to mail one, and told us to go to local Comcast office, even gave us the hours. Went to office and it is PERMENTLY CLOSED. Located nearest office that is open (35 miles away), made appointment, exchanged box & remote. Remote would not program correctly, so after an hour on phone with a technician, he had Comcast send someone out to program the remote.

Well guess what? Channels are still freezing and we are still getting the error message, "Cannot connect to the Internet."   We have to reset the box to get the TV back on. To say I am pissed to the max is an understatement. Someone PLEASE fix this. Comcast, if you know this is an ongoing issue, you need to be up front with folks and quite "kicking the can down the road, leaving customers to disappointed, frustrated, and angry."