If your Mavic is anything other then full bars reception at 150yrds out with no obstructions, then you have some major issues taking place and need to get it to home point asap.
The only time I have known something like this to take place, is from an android user that has powered the A/C (aircraft) and selected the Auto TakeOff feature with little time in between. This person also did not know the Flat Side of both antennas was suppose to face the A/C at ALL times.
There has been a number of post from those that has been around awhile that give the heads up on being patient with updating firmware. Being patient is allowing a good number of days to go by before upgrading any firmware or app versions once released. If you can't wait, then obviously any such issues you encounter are on you. There will be nobody else to blame but yourself. The season to fly and enjoy your A/C is here now. Nobody wants to waste their time waiting for their A/C to go through the repair, replace, or refurbished process.