Panasonic GX80 (GX85) tracking focus failure

This footage was made using Panasonic GX80 (GX85 / DMC-GX7 Mark II) and Panasonic 12-32mm f/3.5-5.6 ASPH MEGA OIS LUMIX G lenses with the stabilizer on the lens turned off, but in-build stabilizer on. It seems the camera can't focus while the subject is moving. This problem can be experienced on other Panasonic Micro 4/3 cameras as well. My Panasonic GM1 is producing the same glitch, and I hoped that it has been fixed this on GX80. For me, this issue makes the video recording feature useless. Another example with Panasonic GM1 + Pana 20mm f1.7: https://www.youtube.com/watch?v=uA9V_1c9zlw Forum: http://www.dpreview.com/forums/post/57759584