Significant Drop in download speed cbr750

I use the Netgear orbi app on iPhone, and I use the built in speed test on orbi login.com and xfinityspeed test website on my hardwired computer. All consistently give me between 500 and 600 mbps for download speed. These tests used to give me between 1200 and 1400 which made me extremely happy with Netgear. Now I’m not getting the speed I pay for and I really don’t want to have to go back to renting from xfinity after spending so much money on orbi.

Also I have an update. An Xfinity tech just checked lines and all looked good for 1 gig speed. He hooked up one of their modem/router devices and we got 948mbps using xfinity speed test. So it is definitely my orbi with the issue. If this is a firmware thing I really hope Netgear gets this fixed because I’m getting so much crap from my spouse for going the expensive orbi route. :(

I upped the CTS from 64 to 2347 but didn’t observe a change in speed.

2.4 ghz is set to 11
5ghz is set to 44

Would factor resetting my device possibly fix this issue?