This is one reason why we don't have this on android yet. It was one of the main issues we were working on before stopping.
The DJI Pilot/GO app is very CPU-intensive, which can cause many mobile devices to heat up and start throttling the CPU, which then causes video signal issues. Just running the DJI Pilot/GO app causes my iPad Mini 3 to get VERY warm within about 6 minutes, and the video starts to pixelate, then stutter and freeze. High ambient temperatures above 95F and direct sunlight hitting the device screen at temps above 80F can exacerbate this problem, causing the device heat up faster and start throttling the CPU even faster. Antenna position is critical as are HD Link video settings. See below for details on the settings I use to get good RC signal and fluid HD Link video at distances out to 2.6 miles with stock P3Pro.
Using a sun hood protected iPad
Air 2 as my mobile device, I've flown my P3P out as far as 13,820 feet (4.2 km, 2.6 miles) from Home Point using Custom channel 20 and 4 mbps Video Transmission Rate (settings on HD Image Transmission Setting menu) and had full RC signal (4-5 bars) and smooth HD Link video at that distance (and all distances in between). However, battery level was at 47%, so I had to turn around and head straight home at that point. Landed with 12% battery. I have a half dozen other flights between 7500 and 12,000 feet max. distance also without RC signal or video problems. These flights were all with previous firmware. On latest firmware I've only had one long-distance flight so far to 6100 feet from Home Point - again with full RC signal and no video problems.
These are the steps I suggest to get fluid, reliable HD Link video:
1) RC antenna parallel to one another with wide, flat sides facing the P3 Pro at all times. So, if P3 Pro will be out in front of you at some distance, the antenna should point straight up; however, if the P3 Pro will be directly overhead, antenna should point straight out parallel to ground. Proper antenna position is more important the greater the distance between the P3 Pro and the RC.
2) iPad
Air 2 is protected by a sun hood (on bright sunny days) to prevent thermal shutdown due to overheating caused by direct sunlight on iPad display. Remember, if you DO experience a thermal shutdown of you iOS device, the RC is still controlling the P3 Pro; use the RC sticks to fly the P3 Pro and you can still activate RTH using the dedicated RC button.
3) Power on RC, iPad
Air 2, start DJI Pilot app, and turn on P3 Pro battery. Calibrate P3 Pro compass and iPad
Air 2 compass (if requested).
4) Shut down all other background running apps on iPad
Air 2 except for the DJI Pilot app, of course. Do NOT use any screen recorder apps, such as Shou, as these can cause video lagging and blackouts.
5) In General Settings, turn Enable Hardware Decode ON (this is IMPORTANT). FYI - I also set Video Cache to "Recording" and Auto Cleanup Video Cache OFF, and it hasn't caused any video issues, thus far.
6) In the "HD" menu (Image Transmission Setting menu), set Channel to Custom, and watch noise graph for several minutes. Select a manual channel between 13 and 20 with the least amount of noise that also does not have any intermittent large noise spikes. 9 times out of 10, I end up using Channel 20.
7) Set Video transmission rate to lowest setting (4 MBps). This will lower HD Link live video resolution slightly, but the lower resolution is also less taxing on CPU, max. range is increased, and you can achieve higher frame rates. For video monitoring and shot setup, it's better to have high frame rate, stable HD Link video at slightly lower resolution than lower-frame rate, stuttering, pixelated, higher-resolution video.
8) Make sure the RC antenna remain facing the P3 Pro; keep changing your body position and antenna tilt, if necessary, to keep wide flat sides of antenna pointed at P3 Pro. This is more important the further the P3 Pro is from the RC.
9) Note: do not put your device in Airplane mode or shut WiFi off.
10) It does not matter in this case, but this suggest was also before the 32 channels.
*Note-The info above relates to this subject 100%. Some of the text above was copied and paste from a conversation I recently had with a friend of mine. (just being honest)
