You're going to need to have someone take a look at the signal to your house. Next time you talk to someone ask them for the "upstream, downstream, and SNR" to your modem and write it down. Ask them to look at the historical charts for those over the past 2 weeks. What you're describing could be any number of things, old cabling, animal damage, weather damage, etc. Regardless, the data the system collects will show things are wonky.