This seems related to my experience. Verizon just sent me a CR1000A to replace my G1100. Everything is fine on 2 laptops (one wired and one wireless) and 2 phones using wi-fi. In fact, the Wi-Fi signal is stronger so we want to use the CR1000A. However, speeds are terrible on one desktop. Disabling IPv6 on the router brought everything back to where it was with the G1100. I'll check tonight, but maybe the NIC in the Desktop is older and unhappy with IPv6.
I also tried disabling IPv6 both in the router and in the NIC. It made absolutely no change for me and still had the horrible speeds. I'm glad it seems like it might be working for you.
I switched my CR1000A units to pure Access Points. Where my main router assigns all the IP addresses. But to do this, the uplink needs to be on a LAN port.
I had hoped the CR1000A had a true AP mode. Where you connect to the WAN port and select AP mode. That way, I could still use the LAN 10GbE port to connect to a PC.
But I'll just need to keep my PCs connected directly to my main 10GbE switch or to my secondary 10GbE switches. Since the other two LAN ports are only 2.5GbE. I really wish all the CR1000A ports were 10GbE capable, then this wouldn't be an issue.
Plus, using the CR1000A as a true AP, means I cannot access any info from it. I need to move the uplink from the LAN port to the WAN port to be able to make any changes to the settings. But I guess I understand why Verizon doesn't have a true AP option for the CR1000A. Since they probably don't want their customers using it this way.
But my two CR1000A units have been rock solid. So I can't complain. I currently have five WiFi 6E 6Ghz capable devices, with hopefully more coming in the next few months, as I upgrade more devices. So, as an AP for WiFi 6E and WiFi6(with 802.11ax) devices, I have been very pleased with my two CR1000A units. For the devices that are capable, they have no problem maxing out my Fios gigabit Internet speeds over WiFi from the CR1000A.
Recently got a CR1000A and running into the same issue with my wired moca connection, regular gig download but around 30 upload. What's funny is the only reason I have the gig plan and this new router is because I contacted Verizon a few weeks ago about getting a gimped upload speed on my 300 symmetrical plan and they gave me both these for cheap, only for the problem to be even worse with this new router. It looks like this thread is still live, should I just give up on this router and ask them to replace it with a G1100? The CR1000B user guide is available when I google it, is it in circulation and does it fix this problem?
I just ordered my third CR1000a off of eBay. Hopefully there are no issues with it. Since it is an open box. The first two I got off eBay were brand new. And they have been rock solid.
@pius if you are connecting the Verizon router to the ONT and using it as your main router, recommend sticking with the G1100. No fixes as of yet to making the CR1000A when connected to the ONT as main router regaining full upload.