I concur with Ian, I used to use "prosumer" Dell switches that didn't support STP in my home LAN + Sonos, and after making changing in my Apple Time Capsule router (and forcing a reboot!) there would frequently be broadcast storms. I upgraded my switches to the new Dell switches that support STP, and it hasn't happened again.

Primary: 818v3+ID41, M6 stereo pair, M SpeakerLink cabling, Sonos+96kHz Cullen, silver DSW
HT: Marantz prepro, 271, DSP3300, 8K SE FL/FR pair, DSP M6x2, DSP320x4 (ceiling), black DSW, 520 RL/RR rear in-walls
Living Room: G65, 640 L/R in-walls, UHD722, MS600
Vac. Home: G61, HD621, 4xDSP3100, DSP3100HC
MDMS:NUC/ROCK+TrueNAS Core 12.0 ZFS file server