Humidity causes rust, so if you live in a humid area---yup---over night will do it.
TV and router? Well, I live in an area with erratic power, and after losing equipment a few times, invested in surge suppressors for my entertainment
equipment and a filtered UPS for my main computer.
If you are using a cable router for TV and internet, I would assume the problem may be there---if your neighbors have the same problem, maybe some
drunk ran into your local junction box.
Seriously. I had one connection that would get erratic every spring and fall, but by the time (usually a month or so) someone came out to check it, it
was all right. It took 4 years until a repairman showed up at the right time to trace it to a junction box 4 blocks away, covered in weeds, that had
been run over. When the weather changed in the spring and fall, the wires would expand or contract just enough to short out for a few hours a day when
the sun hit it "just right".




