Hmm, I don't know. I own a lot of (mostly older) Behringer gear and never had a problem. In fact, the older Behringers are pretty well crafted units. The switches on the newer Behringer "Pro" units look less convincing to me, though.
There are two different versions of the Edison, the German one and the Chinese one. The older German Edison has rectangular LEDs directly next to each other, the later Chinese Edison has spaced round LEDs. The German one is either TRS or XLR ins and outs, the Chinese one has both.
I have an ancient German Edison and never had any trouble with it. So I don't think the swich is a common problem, and you should get it replaced.