You may need to slightly relocate the antenna or experiment with a small metal plate underneath it. Pioneer unuts require a small metal plate under the antenna, and they make one available with the unit.My 2002 Coupe navigation is showing the wrong current car location
this happen all of a sudden it was working fine before
I think the antenna went bad, I bought the antenna on ebay
It's possible the connections are loose.
Hard for an antenna to go bad if it was originally working.