MoCA set up - POE filter fails after less than two years?

For the second time in less than two years, Cablevision has left a note in my mailbox that there is "Return Noise" on my line. On a rare work from home day, I did have several internet outages this morning.

My POE filter sits outside, exposed to the elements. The last time this happened, Cablevision came to my house and just removed the filter while I was at work. I replaced the POE filter (I bought two last time), and just replaced it again. I ordered them from Amazon (http://ift.tt/1pKIZum).

I hesitate to call Cablevision as the last time I did this, their techs knew nothing about MoCA or POE. Again, they came to the house and just removed the POE filter.

Should the filter fail so soon, and should I be replacing it regularly?

Also I noticed that after replacing the POE filter and restarting the modem, the upstream light is (solid) yellow. All other lights green.