Upload the txt file to Healthy Drones and see if you're getting any error messages. In the interim, bring in the usual suspects - shut down the GO app and reboot, look carefully at all of the cables and the antennas. Look at the P3 legs - that's where the antennas are - to make sure nothing is broken off or obviously messed up.
You mentioned two separate locations - I assume that they really are different areas, not just, for example, different ends of the same field. Local conditions could certainly be an issue.
If you can get back to your flying area easily, look at the screen in the GO app which shows channel strength. That is a pretty good indication of your RF background. The GO app is pretty good at finding the best channel. You can certainly lock on to one but there is probably no reason to do that.
