The logs show the inference time of the tracking model almost doubled in the first video, which suggests your iPhone 13 was likely overheating. What was the outdoor temperature at the time? A tripod umbrella to block the direct sunlight may help.
@gchen I remember you said before that DJI Osmo Mobile 8 have some problems so it can not be compatible with Folocam. But now someone can use this gimbal to record. So problems was solved, is it right?