Goodmorning, I share my experience. I had the problem of poor and unstable fix gps. On road, beetwen high building, under trees but on open roads too, my P9 plus (VIE-L09 firmware c432B387) doesn't fix satellites. I read yours experiences and I opened the device and I cleaned the pins sited on the upper left corner (which has contact with the metal plate on the gps antenna) with a cotton swab and simple liquid for clean glass. I tested the fix disabling all connections, activating AEREO modality and setting "only GPS" in the GPS searching mode. Magically, the fix gps is almost instantaneous. At moment of test, I was on balcony on second floor with other two floor upper me and beetwen other buildings. link GDrive to screen capture https://drive.google.com/file/d/1FAe0XOc...
