Schlage connect wont work unless the hub is touching it

To beam my internet to my shop (1.5 miles away) i use the ubiquiti m900. I had to use 900mhz to get it through some trees as the 5ghz would not work. But with the bean narrowed and a higher channel (924mhz) i have not had any issues with zwave. I have since added more items with no issues what so ever. Im sure my problem is unique… But i would have never thought that a 900mhz access point over 30 feet in the air. would have ever been the issue…