1985 RCA console crackle

[kb12]

Hello all, I got a 1985 RCA console TV for free on craigslist a couple of months ago. It worked great until just recently. Every once in a while it makes a crackle and there is a white static line that goes through the screen. It doesn't happen all the time. I know its an old tv and its not going to last forever I was just wondering if this was a common thing and what could be causing it? Perhaps an easy fix? Thanks!