New fiber installation

Since this ‘installation’ we have had repeated issues with our cable service for the last 3 days. The tv works yet we can’t get Xfinity on the screen...just a message stating ‘we are having problems’. We tried the diagnostics from the Xfinity app and were able to get the service back the first day but the same thing happened on the following two days. On the third day we called Xfinity and through an automated system were told they would restart the system. That seemed to work but was only temporary as when we turned the tv back on later that same day we had the same problem. Everything was fine before this installation of new fiver started.