Orbi AX4200 / RBS750 - period website disconnects

Hi - i installed this system over the summer (router+2 satellites) and wifi is working great. however i am often experiencing certain web domains to be unavailable for short period of time (1-2 minutes). During this period, everything else is functional and other websites will work fine. This often happens with common domains (google etc) and appears to be totally random. It is also consistent with any device I try. 

I'm curious if anyone else has experienced this? Perhaps something with the device firewall but i've tried disabling the security features and same issue continues to happen. Did not experience this prior to installing the wifi system so i don't suspect this is due to my ISP.

Thanks in advance for any insight!