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Based on my experience with one that could be the problem. Tried everything. When I switched for an Icom, & with same antenna & wiring. I concluded the problem was probably an internal earthing problem or something like that from new. ie a quality control problem.
Although I get the impression that yours used to work ok?
2006 4.2TDi ex-Telstra Remote area Camper. Patrol Sold after 11 years of ownership Replaced with 2006 OKA NT Expedition Truck. Cummins, Allison & lots of goodies A Nomadic Life (Blog)