I am also having intermittent loss of signal (+pixelation, etc) for FibeTV. In my case, the signal loss coincides with the HH2000 momentarily dropping the DSL connection. This happens when the weather is bad (rain, heavy winds). In my case, most routing and wifi functions are done by a pfsense box.
I am troubleshooting the issue with Bell.
How far away is your house from the node? Do you have Internet drop outs as well? It would surprise me if your internal network was mucking with FibeTV.