I will throw this out there, too. My first thought was this might be some sort of MoCA 1.0 vs MoCA 1.1/2.0 mismatch. My STB is a Motorola HD QIP 7100 1 is running with MoCA 1.0 supplied from a Motorola NIM 100. (My installation is old.) I don't (think I) use the MoCA feed from the ONT. I am provisioned for Ethernet from the ONT as well, which is where the NIM 100 gets it's feed.
However, others here seem to have that same STB running directly from the MoCA provided by the Tellabs ONT 612A ONT. Does anyone know if that is MoCA 1.0 or 1.1 or 2.0. This page leads me to believe it is a 1.0 device. It says, "Successful devices are awarded MoCA certification, which allows a vendor to use the MoCA logo and claim compliance to the MoCA MAC/PHY v1.0 ratified standard." If that's the case, I could probably get rid of that NIM 100. (My old ONT, a 611, didn't have MoCA.) Maybe I am using the MoCA feed from the ONT.