I suggest you call the tech and they'll install a better splitter and make sure, as it's been said, that the signal is strong enough.
At first, I only had TV (2 digital + 3 analog) and the tech installed a regular splitter (1 in, 4 out) plus another splitter (1 from the first splitter became 1 digital + 1 analog only).
When I also switched for phone + internet, he installed a powered splitter and since then the signal is incredible even with analog. They did not charge me anything to do that, and their work is guaranteed. Those splitters costs more than $50 so why pay for this yourself?