I would guess that a signal booster or connection went bad and just needs to be replaced, I'm not sure why the cable technician didn't trouble shoot while he was there since that's what they always do in my area?

If this home wasn’t being used a ton before budget in for repairs as a sudden change in use really affects things like your booster pump and pressure tank.

@Jon Klaus thank you Jon for this reply it was a real confidence booster for me in investing in the outer cities !

If its a low pressure situation from the city , install a booster pump 

Alternatively, you could also look into a wifi signal booster in both homes OR you could also get more than one router for the same connection (Verizon does this) 

I understand the risk and reward behind the arbitrage strategy but don’t you guys think up to a certain point our liquidity will run out and this will become a cash flow booster?

DOes anyone use a "booster amp" with an iPhone or is it even needed by those that get in intermod alley (areas of interference) or out in the boonies?

we did use a pressure booster pump for our whole house at one point but that would increase pressure overall was my understanding.

I got a WIFI signal booster upstairs for the BNB and I cover the additional $20/m for the internet. 

In most situations, running an electrical circuit is easily accomplished with minimal damage and rework.120v in-line heaters are meant to be used as boosters for water that has already been pre-heated but where additional rise in temperature is required - the most common examples would be in washing machines which have steam clean or sanitary cycles and in dishwashers.