Hi
I Had the same problem here,
The problem was solved when I used u PoE Injector from TP-Link.
I was running not a a beta.
Cat5 cable from rack to frontpanel, original cable to floorboard, cat5 to remote.
I Never had the problem running the original cable from rack directly to remote.
My Opinion is that the signal is really weak when you gonna use longer and combine multiple cables.