We have a hopper with three wireless joeys and for several months we have had no problems. But now we are experiencing low signal strength to one of our upstairs joeys. The signal strength varies between about 18 and 30 and stays in the yellow most of the time. It seems to be worse in the mornings when we will occasionally completely lose the picture. Right now it is at 25. The other two are 74 and 100. I have swapped it with another and the problem remains in the same room so I think the problem is the location. I got a 25 ft HDMI cable and tried moving the joey to different locations in the room and I can realize some improvement but not enough to make any permanent changes. The joey is only about 50 feet from the hopper but it is a diagonal shot through a floor and three walls. Is there anything that I can do to improve the signal to that joey. It is in my wife's sewing room so the heat is really on. Thanks for any help you can give.