I had the same experience which was addressed by putting an upload/download limit on the roon wireless client. I was able to do this as I use a Ubiqiti network at home.
This has resulted in a throttling the bandwidth but no deterioration of the streamed music.
Without the throttle, the roon core would pull from upstream (Tidal in my case) at the highest download speed as possible, and the roon client (wireless) would I think congest wifi (which is 2.4Ghz on my roon endpoint).
A bit of a kludge, but it seems to have sorted the issue for me.