Router blocking me from random websites

Since its a Broadcom chipset based router I would disable MU-MIMO, on Broadcom based AC routers regardless of brand it can cause performance issues as Broadcom didnt do a great job of implementing MU. Secondly, MU on a 3 antenna router is pretty pointless as most clients have 2 antennas and for proper MU functionality to have 2 dual antenna MU devices reciving at the same time you need 4 antenna routers. The only AC router on the market that does well with MU is the R7800 (4 antennas), it uses a Qualcomm chipset, and its Synology equivalent the RT2600ac as well which uses the same hardware.