GPS accuracy losing

Bug description: sometimes GPS navigation application lose GPS accuracy. But the utility programs show that everything is ok.
Affected version:
Steps to replicate: Just start GPS and wait for 10-15 min until GPS accuracy has lost

In the “GPS Test” application I can see that the GPS accuracy is ± 3 meters.

But navigation applications (google, yandex etc) draws me huge circle.

I returned to the official firmware. GPS is working fine. So it was a software bug…