My dsl connection stops at specific times

Hello,
So they do not work together. But thats not the problem, my office closes at 4:30pm so the router over there is switched off. I have internet access at home from 4:30pm but it stops for no reason at 8:00pm even though the office router is off. The internet access comes back at around 12:00pm and sometime doesn't come back till 1:00am. I tried going to the office to test the internet there, it worked perfectly. Tried the office's router at home it didn't work (don't know if I need to change any settings for it to work even though it's on the same line). My ISP provider sent out a technician that claimed that the line cable got humid (it's been there for 30 years). But why does it work at specific times only? I don't know if this is important but my home router acted weird today; I was watching youtube today when the internet suddenly stopped (at 7:00). I went to check the router, it was trying to boot but failed every time. When I tried to turn it off i felt heat going out the power plug. While trying to unplug it I burned myself. Smoke was going out from it and it smelled like burning. I left it to rest for 5 minutes then when I plugged it again it worked perfectly.
Fyi: The line cable all come from a same room located in the bottom of the building of my home. One cable goes to my office (which have been here for less than 5 years) and another to my house.
Thanks and sorry if did any english errors.


Thank You


I didn't find the right solution from the Internet.
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