On the xda forums here someone tested the GPS with other custom ROMs, and this seems to work well. This makes me suppose that the problem is most probably software related, and the bug was injected at some firmware update in August 2015. As from GPS test app the satellite positions are loaded, so the AGPS is working, but the signal fixes are very weak. Something seems to disturb the GPS antenna at acquaring stable signals. This is only my impression though, could be that I'm totally wrong.
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Same problem here, I adressed the problem also onto the xda-developers forum here. Used the GPS Test app to test the sensor, and it seems to work but with a very low SNR (Singal to Noise Ratio) of about 15 to 20, resulting in very poor performance. The accuracy almost never falls below 10m (~33 feet) and the sensor is useless for car navigation apps, like Google Maps. The GPS chip was working fine until August 2015, when I shipped the phone for repair because of water seepage. They gave me a brand new device with this annoying GPS bug. As I can read out from the other persons on this thread, it seems that someone has a the same performance problem, while others can't even reach a 3D fix. It may something related to jamming signals coming e.g. from bluetooth or even mobile network antenna amplifier, but it sounds wierd cause normally these things are well tested to work togheter flawlessly. As said to the xda forums, I tried to reflash the firmware and reinstall the os with pc companion, all a waste of time. Even returning the device to the service seems not to work, people in this forum and on xda said that the smartphone came back with the exact same issue. Will Sony finally take this issue seriously? I'm getting really annoyed..
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