after update to l2.5.4 code on my apm1280 with disabled cli logging and gps set to MTK16 (not AUTO) the gps stopped working. status led on gps is on, but the gcs says "no gps" and loiter is not working. after compiling with auto, everything is ok. if i run gps test (auto), it says GPS MTK16 ok and then "no fix" without change, even tough the gps led is on (no blinking). any toughts?