I have my FOURTH LTE Network Extender (ASK-SFE116) that doesn't seem to work... it boots up fine - my iPhone 11 Pro connects to it, as does my wife's Samsung S20.. the phones show 5 bars... UNTIL I go to make a call. Then it pauses, drops down to one small bar, and sometimes connects, and sometimes doesn't. When I hang up - it goes back to 5 full bars. If I dial #48, it again drops to one bar, and says I'm not connected to Network Extender coverage. What in the world does one have to do to get these to work??