My 7.1 is working reasonably well still after the latest 3.3 firmware. Some issues that I have noticed:
When watching UHD disks in dolby vision (or HDR) on my bluray player, it will now cut out for a minute/blank screen, almost as if the connection is being lost between the bluray player, soundbar, and TV (C8). Kind of annoying, happens maybe once or two in a movie for a few seconds. Reproduced on different disks.
I had a really strange issue where the soundbar seemed to just.. freeze up. No audio from any source, pressing anything on the remote basically did nothing or had minute+ long delay from being registered. I ended up unplugging it, and it didn't work. Then unplugged the HDMI cable on my fios box and plugged it back in, and things seem to be working again (strange).
Random annoying/strange HDMI CEC issues between my set top box (FiOS ONE 4K mini), TV (LG C8), and bluray player (ubk90). Had these before the 3.3 update, though. I really wish Nakamichi would pattern with say LG for full Magic Remote support (same with FiOS, etc).
Still holding out hope that most of this can be correct in a few firmware versions...