Pixelation issues again.

In the last year to year and a half, we've had our gateway replaced (unfortunately with refurbs) due to pixelation/freezing issues.  It resolves for some months and then starts up again.  It seems to start/get bad in early evening and programs become unwatchable.  I've done the whole 9 yards over and over again with the rebooting/unplugging and nothing on/near our system has changed in years.  So, I'm asking for yet another new gateway.  Maybe I'll get lucky this time and actually get one of the new ones.

Thanks for any help,

Linda [edited for privacy-please do not post personal or unique information such as but not limited to full names, employee ID numbers, email addresses, phone numbers, account numbers, etc.]