AC5300 Nighthawk X8 AC5300 Tri-Band WiFi Router - lack of STP protocol support for SONOS

I was reading the product manual for this router and found out it does not support STP (Spanning tree protocol) which is used by the SONOSNET network. I cannot plug in more than one speaker to my wired (ethernet) home network as it causes a broadcast storm. Is NETGEAR working on a firmware release to correct this issue? This was a very expensive router that I bought recently to replace a 12 year old Linksys router (which by the way supported STP).
Is an option to get around the lack of...

AC5300 Nighthawk X8 AC5300 Tri-Band WiFi Router - lack of STP protocol support for SONOS