Netgear M4350-24G4XF - Multicast

Hi Community,

We recently purchased the aforementioned switch to replace a failing Xtreme. We have our VLANS setup and for the most part things seem to be working. Prior to this new switch we had another configured as the multicast querier, but the goal was for this switch to take over the role. We've been experiencing network & internet performance issues; it looks like the switch is flooding the core. I'm attempting to disable Multicast router on the uplink port, but it won't disable, and I can't figure out what setting is enabled that is preventing me front disabling this option. Or maybe we have a multicast configuration problem. 

Any feedback would be greatly appreciated.