MOCA POE filter and Comcast Voice filter

Hi. I 've recently set up a MOCA network from a Roamio Plus and two Minis. One of the Minis frequently shows an error "finding a tuner..."



I haven't yet installed a MOCA POE filter because there is already a filter at the POE that I recall Comcast installing when I got their Voice service a while back. Unfortunately, the Comcast-installed filter doesn't have any (obviously visible) markings.

• Would MOCA signal leak cause the upstairs Mini to be unable to find a tuner? What could be other causes (no, I am not recording 6 shows at once on the Roamio)
  


• Any idea what this existing filter may be and will it cause any conflict with the MOCA POE filter? If no conflict, should the MOCA filter go before or after the existing filter?

Thanks!