A few flights under GPS waypoints showed Phantom connection lost on phone screen and screen was freeze for a while. I know the signal could be blocked by the buildings or tree. When this warning popup, the PV2+ was keep flying from one waypoint to another, the signal picked up in few seconds later but I was panic. What is the proper procedures when seeing this error message on screen ? Click Go Home under Ground Station ? or Fail safe under Course Lock mode ? or just ignore this message ?