I have a very similar set-up network wise but with an 818 and have also had similar issues.

The fact you have 2x Netgear switches rules out some issues I was having with TPLink switches.

It may be worth turning everything off including router and then turn router on 1st, followed by core and then the endpoints.

I have found doing this has made my network more stable.

Music Room: 818v3, DSP8000SE (SpeakerLink cables), iPad control
Shunyata Denali Power Distributor, fed by SIgma NR V2 + Sigma digital(818) + 2x Alpha NR(DSP8000SE)
Network Acoustics ENO filter + Rubicon Switch(powered by IFI IPower Elite)

Office: Stax SRS2020 via ifi Signature
Spare: DSP5200 + MC200

Running Roon Core on SonicTransporter