in my setup (86u+68u as node) not remember qos settings, always back to custom (i set to media streaming).
QoS settings reverted back to default is an old, documented bug that affects the RT-AC86U and RT-AX88U. Asus are aware of it, it should finally be fixed in their next release.
Yes sorry for spreading unproductive negativity here i know, but when i made another thread some1 deleted it. Why?
Threads are very rarely deleted on the forums. If they are, it's usually because they are discussing illegal topics, such as running Asuswrt-Merlin on a non-Asus router for example. Or, your thread was simply awaiting moderation because it contained a keyword that triggered the spam filter - one of the mods usually releases these sometime during the day.