Uninvited guest in the house
Uninvited guest in the house
I secure the door when I exit the room. After that, the neighbor typically retires. Not through power cables or internet connections like TV or Wi-Fi.
If someone can reach your PC, it's a small chance. Before starting, look for any out-of-place programs when you boot up. If you're really worried, perform a reset and reinstall. Also, ensure strong security settings like bios/uefi passwords or just secure your system properly.
It's feasible to gather information from power lines, though the speeds are very low and the gear is costly and large. This makes it hard to conceal. I'm not aiming to be dismissive, but do you know if free mental health services are available in your country? By the way, based on what you said, both of us could gain from some form of counseling.
OP is in his room and notices his roommate moving around the house. After 20 minutes he hears the roommate connecting something to a wall outlet. Believes it might be remote access through the Ethernet or Wi-Fi in the walls. Likely just plugging in a phone charger or something similar.