cable and TVs user Infra-red remotes, that require Line-of-Site. Security systems use a wireless RF technology, so its completely unrelated. Possibly your security system could mess with your cordless phones, or wireless internet/networking, but your TV/cable can't be related.
what you are describing sounds like what can happen when the battery is low on the remote, or the sensors are partially covered... check and make sure you have new good name-brand batteries (duracell, energizer), and maby use a little windex on a paper towel on the front of the remotes, they usually have a extremely-dark red surface, that the transmitter hides behind, and clean it well... then find those surfaces on your TV & cable box and make sure there isn't anything in the way of them, and clean those with the towel/windex
· 10 years ago