Identify a problem before trying to fix it. Surge protector is for something that occurs maybe once every seven years. If you have not properly earthed a 'whole house' protector, then that plug-in protector may even make damage easier.
Find where and when a signal does and does not work. Does TV's computer talk reliably to a modem? Does modem talk reliably to the ISP? Do you know how to use simple diagnostic tools such as PING ? Do you know how to use diagnostic tools or statistics found inside that modem and TV? Do you know what modem and NIC indicator lights report? Exactly what occurs simultaneously when signal is lost? What are signal strength numbers? Do you know that electronic power supplies have massive filters and regulators so that AC line noise is completely irrelevant? These answers are necessary to focus on potential problem and to ignore urban myths that even promote that six outlet protector.