I have tested versions 8.0.1b, c, d, e, f, h (version g I skipped).
Last version where I had no problem with this test files is "d". There are all files plays smoothly and Dolby THD plays correctly. From version "e" to "h" I have jerky playing on some files (seems some 30fps high bitrate files) and no Dolby THD. All version tested on the same setup. LAN connect is no problem, the same result is on USB. AV receiver works properly, there is no problem too.
Thank you very much for your work!
Thank you for testing and providing your results. I think I'll make something out of it...
8.0.1i is available to download from Index of /s905/8.0.1i/
I wasn't able to test it properly so no update to OP yet, please install only if you know how to downgrade if anything goes wrong.
Changes include chapter skip/channel switch improvements from afl1, CEC improvement from GDPR-1, THD/Atmos fix,
audio noise on boot fix, high bitrate video playback fix and backported Ethernet driver from Nougat kernel - Amlogic says in commit history that suspend should now work...