That Amazon splitter is a power passing splitter, which leaves it open to passing voltage spikes on the coax through it.
I would replace it just for that reason, because technically, everything should be DC isolated.
Power passing is for satellite use, or if you have something actually being powered through the coax(antenna pre-amp, remote control extender, rotator, etc.), of which nothing on Fios is.
Not that I would waste any time dealing with Radio Shack, but they probably could sell you a inline DC block for a small fortune to make up for the problem that the splitter is likely causing.
Preferably, you should get a good name brand CATV type splitter, like this,
because they don't pass static surges or DC.--
ROCK 'TIL SUNSET