networking

Back in the bad-old-days of having a shitty provider in student housing, I had a similar situation, and solved by making a box-of-faraday with a carboard box and tinfoil. Popped their crap modem inside, put my slightly-less-crap modem next to it, and ran my functional CAT5 (yeah, it was a while ago) out of the box. The tinfoil creates a nice interference-free zone, where nothing but your own two devices exist.

Of course, this was also before my phone had wifi, so it has it's downsides, unless you want to add a third accesspoint outside the box.