You don't suppose it has to do with these StableLoc issues ????
Here's an older thread:
https://talk.newagtalk.com/forums/thread-view.asp?tid=745961&mid=6386796#M6386796
I thought there was an update, also. ( unsure if it was update for BOTH GPS6500 and Monitors) Something about only a Ag Leader Dealer could perform the Updates. too.