Pure disappointment 1

With a lot of expectations, which has been fueled by the full-bodied advertising statement by the manufacturer, I took the unit into operation. That was easy, since I have a Fritz! Box the latest generation. My router is in the basement and on the ground the MT-F should work primarily.
The voice quality is a bit noisy, but I! Box was standing next to the Fritz (best signal strength). After I proposed me accept the fact occurred every now and then disconnects (without previous range warning). Even in conversations with nearly full signal strength indicator that happened. I can not say whether the Fritz! Box transmits to blame, or the MT-F, but I'm going to replace in no case my great Fritz! Box against another. AVM devices should, in my opinion, be well matched, but with the MT-F, it was probably nothing! I sent back the part.