Poor signal Healthy drones

[Jayfdee]

I have been using Litchi and reviewing flight data on Healthy Drones. On the signal strength report I used to get all green, full strength reported. Now I am getting poor, or very poor, even at the home point.
The Litchi app is reporting full bars, and I am not having any flight problems, no RTH etc.
It may have coincided with a firmware update, not sure. See image.
Any suggestions?
[file]poorsensor|none[/file]

 

[Jayfdee]

Solved.
I went and did a series of trials with the DJI app, and the Litchi app, with both apps I flew with AZ screen recorder app running, and not running(Nexus 7). Finally a Litchi trial with AZ running, but with the Nexus mounted on a tripod away from the controller.
The results show that the AZ screen recorder causes the Healthy drone site to report poor signal strengths. When I put the Nexus on the tripod with AZ running, I get all green from Healthy Drones.
Strange but true. So I know what causes it, but not why.
On a separate note, I solved my tilted horizon. I used a launch board with a 2 way spirit level, set up level before arming the Phantom, and I have a perfect horizon. This is good as I live on the coast and film along the coastline.