I have had this issue for sometime. I found that the ethernet port on the back of the Kemper is the culprit. You need to make sure that the CAT5 cable is pushed in all the way. Evidence of this is that you will see an amber light flickering. I believe this means that data is passing to and from the remote. Unfortunately, any slight bump that causes the CAT5 to move from a fully "pushed in connection" makes the connection drop (no amber light flickering). I wish Kemper would have used a Neutrik connector on the Kemper head as they did with the remote. I have to tape the damn thing in too get a reliable a connection.
Regardless, I love this thing. I use it in the studio and in every live situation coupled with a Friedman ASM-12.