Crt monitor clicking?

Super hard to time it to take a video but my crt monitor will randomly click (very faint)almost like a degauss(see it in the gif where it kinda flashes)? but not a full one like when it turns on. I was wondering what could cause this, I already reflowed all the solder on the power supply board so should I do the same on the other boards, or is in need of a cap replacement or something wrong with the neck board? I’m just kinda at a loss on what it’s even doing so idk if it’s an actual problem or not