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Hi
Glad to hear you have at least mapped it out.
The usual culprit is two way switching of lights because the live and return may end up on oposite sides of the room making a masive loop. It is possible to sort it out but it involves running new cables so that at ALL points the current flowing to the lamp follows the return current including the stretch going to the switches.
Screened wires are unlikely to help as the frequency is low. You may be stumped because you are renting, in your own place you could just do it properly!
If you are really unlucky the building may be wired with power going different routes. This is against the code of practice in the UK but you are not here!
Another possibility is that someone has added some extra socket or light and just grabbed a live or neutral feed rather than taking it back to the supply box. All in all lots of fun!
Best of luck.
Matt S
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