Since you are splitting and with cable companies changing their systems you may have a problem that involves more than one player. Have the cable company do a power level check at the TV.
My 60" Plasma TV, PN60F5300BF, after 8 mos. now is disrupting my over the air signal. I thought it was a problem with the tuner section. After 3 calls to tech(?) support, who I am not sure know there is a tuner section. I have reset, reconnected, etc. with the same results. Tech insists it is my system and my splitting the signal, this despite the fact it was good till recently. As a final test I borrowed a TV and inserted it into the loop in place of the Samsung. after 24 hrs with absolutely no disruption of the signal at any TV (4) I powered the Samsung with a connecting it to the antenna. the result was a signal disruption. what this means I do not understand, but it is not my system, but a problem with the Samsung. I decided to post this but am pursuing this in what ever way necessary to have Samsung own up to their responsibilities.