iPhone 6 - GPS/direction problems

Issue affects Apple Maps, Google Maps and Waze. Basically, I can locate and obtain directions.

However once I start driving the dot does not move. The screen shows "Locating..." for long time. If the car stops at a light, it is able to find the location eventually. Its like the actual location is not found quickly enough.

Went to Apple Store where they ran the diagnostics report and found all sensors to be working perfectly ok. They performed a factory reset and it worked fine. However after I restored from backup, the issue is recurring.

What could be causing it? Would it be that some apps? Thanks in advance for help.

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iPhone 6 / iOS 9.1