there is the problem with play HEVC video content (stuttering, audio out of sync)
I will need a little more information than this, because the format of the file is only one thing, besides that, there are quite a few other parameters of that media file.
A log would be good (pastekodi), and a part of the file that was played incorrectly would be also helpful if you could upload it somewhere.
I have installed CE 9.2.8 on device and HEVC video play without issue on this system.
I made backup of CE 9.2.8 system and restore it on LE 9.2.8.10, but problem with HEVC video still existing.
Please, do not restore a CE backup on LE, because although the two systems are similar, there are quite a few differences between them.
It's even worse if you try to use pre-compiled CE binary addons under LE, even just a simple pvr addon. This two systems are not (fully) compatible with each other, so please don't do that!
I can only help if the answer to this question is "Yes":
Does the above issue persist under a "clean" LE 9.2.8.10 installation?