Same part of problems here, not sure it started with build 1169 but since beginning of November.
Running a Nucleus Plus with about 260.000 tracks in my libraries. Using TIDAL and Qobuz and my own libraries on a Synology NAS and the internal 4TB SSD storage in my Nucleus Plus.
Slow start of tracks, not able to find tracks, not able to connect my iPads (Pro 2021 version) or iPhone (13) to ROON.
Tested and replaced my switches, Ethernet cables.
Running ROON directly from my Synology NAS which also runs ROCK has no problem at all.
In the Nucleus Plus, this weekend we replaced the standard M.2 SSD for a Samsung EVO Plus 250gb and unfortunately still waiting for the RAM DDR4 2666 1.2V SO DIMM cards.
The Nucleus is still “working” to add the music to my library which will take some with this size but so far it is working well. Even at running at 8 cores now for the time being.
Will keep you posted as when this fixed my problems it could solve yours as well.
Jeff