Problems locking GPS with D810

I have 4 cameras and lock them all to the same UTC time using a Geness GPS ....the 3200/7100/800 all lock instantly but the 810 sometimes will and sometimes wont ....any suggestions ...all the menu options are correct .

I tried a little experiment ..I set it two hours behind ( usually I am asking it to catch up about 4 seconds ) and from 2 hrs behind it jumped immediately to the right time ....strange