Hi Im having similar issues with P3 4K, I flew up 60m and i lost video signal and flew it down but once down i could only fly 50m from the home position (untill i powered down the drone and controller) and im also getting weak transmission even standing 5m away from the drone after the recent FW Update
As a general suggestion, try to explain more in details what you are experiencing, so people can help you.
Couple comments:
- if with "flew up" you mean straight above you, that's possibly the worse position, when it comes to radio signals
- you might very well know this, but remember to keep the RC antenna (5.8GHz control signal) at 90 degrees relative to the AC, not pointing straight at it
- the antennas for the video signal (2.4GHz WiFi) are inside the RC, next to the 5.8GHz antenna, so it helps pointing that side of the remote toward the AC
- what happens after you power down AC+RC? You turn them back on and everything works perfectly?
- are you flying always in the same location? If yes, go somewhere else, possible a remote location with no interferences
- weak transmission with the AC very close to the RC is possible
- in DJI GO, make sure you're logged in with your DJI account, are not in beginner mode or have (short) distance limits enabled. In all these cases, your AC will refuse to fly beyond a certain distance, but it's pretty obvious when it does so I doubt you're confusing this with a weak signal.