one thing you need to relize the longer strech of cable you use. The more noise it will pick up. Then you have problems with disconnects, and slow speeds.
If you start to experience these probelms if you connect long streches of cable. the 1st point you look at is the coupler.. Make sure no dust is in there.. If the connections are a bit loose you will get a micro corrosion. Take a pencil eraser and "erase" the pins in the coupler. This will clean it out.
I'm not sure how far you are streaching, but like 2 50 foot cables you may not notice any differenct.