The line card is only for phone, and that's in the central office. TV/Internet is usually curbside in your neighbourhood, so if the static is affecting the TV/Internet, then it sounds like your line is intermittently crossing with someone else's, maybe not far away.
This is isn't normal, as you can tell by how long it worked good for you. But copper phone lines are susceptible to corrosion, squirrel chews, physical damage, human error, weathering, etc. Rain or humidity sometimes makes these problems show up, but then disappear when it dries up.
Tell the person coming what you mentioned here. Any info helps.
Authorized Service Provider (Contractor) for MTS Allstream. Any views expressed are my own.