For the MoCA issues, i'd call RCN tech support. It's possible that the service tech didn't put the proper filter on your line.
As for the pause live TV and start recordings from a preview, I can answer them. Us in the beta group are testing the starting recordings from the preview and it's working nicely. The pausing live TV hasn't been pushed to us yet, but it's a highly known feature that RCN is aware of and actively working on. Be patient, it'll come.