Short version of the question - do the Actiontec adapters that TiVo sells have a built in filter for the output side to keep the MoCa signals from interfering with a cable modem, or might I need to add that independently? I have a current MoCa setup using a pair of Motorola SBM100x devices that is mostly working except for 2 issues: - I had a ton of C13x problems over the past few weeks, but they seem to have resolved in the past few days (hopefully) - My cable modem (Zoom 5341) has had random reboots of late Back in the midst of the C13x errors I decided that maybe the Roamio would be happier if I was using the official TiVo adapters made by Actiontec so I ordered a pair (pretty cheap, wish I had just gone with them originally, but I got the SBM1000s at a local BB so it was more immediate gratification). They arrived, but in my delays to get around to installing them the C13x errors have seemed to have gone away (an upgrade to 20.4.1 may have caused that). The other reason for getting the Actiontecs was in case they played more friendly with my cable modem and might improve its stability. For that reason, I'm wondering if the Actiontecs will automatically filter the output coax to prevent the MoCa from interfering with my cable modem. The SBM1000s came with separate filters in the box and I haven't used them (yet), but when I get around to experimenting with stability I'm curious if Actiontec+filter would be overkill or not? At this point the simple solution may be to just go with my existing SBM1000s and add their filter to my modem, but the Actiontecs would overall be a cleaner install since the SBM1000s use an external splitter which just adds more connections and visual and physical clutter to my installs - the Actiontecs would thus be less clutter and more officially supported in the long run. As an aside: Note that one aspect of my current setup is that I'm using the Roamio to bridge the MoCa into the rest of my AV cabinet using its "MoCa + ethernet" mode. When the C13x errors were at their worst it was odd that the rest of my AV cabinet had internet service (which would be going through the Roamio) just fine, which I suppose means that the internal MoCa on the Roamio was working fine with my SBM1000s, but I digress.