Strange as I haven't had an issue since I did all the steps in my method above, are you definitely using Pal from here? [Only registered and activated users can see links. ]

And are you using a skin? I have tested Arimi, Wandel, Garrigor and Pongo and all can have the "not responding" in the PIP but not in full screen. Pongo and Arimi seem to cause most instances, as Boki said in post #6 Pongo skin is complicated and in post #2 that split screen or PIP is not iGO's natural environment. The Pal version above comes with default skin which also works fine in PIP for me. I am a huge fan of all 4 skins, with Pongo being my favourite, so I tried a few of the Pongo mods available on the forum and I found this one works great [Only registered and activated users can see links. ]
Its been well over 2 weeks now and its working great.
I am not familiar with your unit, what are the specs and what android version? plus is the android version geniune? Mine is a Mekede/Navifly Dudu7 UIS7870 2.7ghz 8 core, with 8gb Ram with confirmed genuine Android 13