I have Cox ultimate 300 down 34 up

[Drj37]

So my download speed is always over 300 but now my upload is around 8-10 any help it started doing it on my last orbi so I figured it was the orbi took it back to Bestbuy exchanged it out for another orbi and I get the same thing cox has been out 3 times and said nothing is wrong 

[FURRYe38]

Whats the Mfr and model of the ISP modem? Built in router by chance? 

What FW version are you using?

The first wave to be released are only for the RBR50 and RBS50, which is used in the RBK50 and RBK53 (Costco) kits.
New beta FW avaialble. Get it while its hot of the press:

https://community.netgear.com/t5/Orbi/Orbi-MR-2-1-Update-3-23-18/m-p/1533584#M26234

[Drj37]

I have the Netgear cm1000 as my modem 

[Drj37]

I’m wondering if I should try a factory reset and see if that has anything to do with it 

[FURRYe38]

If you have upgrade FW to beta, yes, please try the reset and set up from scratch. I would avoid setting up QoS, Traffic Meter or Access Controls. 

Try a reset then do a speed test with a ethernet connected PC. Should be getting to spec speeds...

Just making sure the ISP modem doesn't have a built in router is all.