Many many years ago, a friend of mine installed a remote control plugin on another friends Foobar (music player) without their knowledge. He then proceeded to troll by messing with the volume and the track playing, not only when he was visiting but also when he would pass by the house. He would check if Foobar was being used and then would troll a bit before continuing. This went on for about 4 months. The other dude was going insane trying to figure out what was happening.

Thanks, I Hate It

This was the same reason for me.

To be fair that advice does work for Index Funds which are low risk and meant to be gathering interest over many many years. For stock trading yeah, you have to be on top of things