I originally started having the problem running v1.4r5 about a month or two. I flashed the firmware to v1.5b2 hoping it would resolve the issue. It did not. I ordered & replaced ahars board, no help. I downloaded Iflygps efb app, problems remained no change. I called Adventure pilot tech support. It was suggested to replace the gps board &/or go to an external gps. I ordered both fro amazon “stratux” store. I installed new internal gps board today, still no change. I figured out how to connect the external gps. Gps lock is fast, unfortunately still no change. Not much left to replace other than the motherboard.