APM2 GPS lock problem

Yesterday my APM2 on the latest 3.0.3 got GPS lock in a minute or two.

Today the blue light just flashes and no GPS lock.

What checks can I do? How can I see in Mission Planner how many satellites it can find?

I’m powering both sides of the APM2 with a steady 5.2 volts.

Any help appreciated.

Did you check space weather and GPS coverage predictions for your location? The sun is currently on an activity-high which temporarily can disturb GPS.