Download speed bottle-necking around 30-35Mbps is usually a sign the modem is entering "partial service" mode. This is caused by a problem with the signal going over the coax for service. Do you have Panoramic gateway? Also, how does the coax get from the street/pole to the room the modem is in? Any splitters, amp, filters? Last, when did the problem start and did anything change happen around then?
PS. I assume this is affecting both wired and wireless connections.
No panoramic gateway. Modem is a Netgear CM1000 V2. Router is an ASUS RT-AX86U. Wired and wireless speeds are both affected equally.
I live in an apartment, so I know the coax comes in via a box at the end of my building. Beyond that, no clue. Not certain of any splitters or the like between the outside coax box and my unit. There are no splitters or anything out of the norm between my modem and coax wall jack. I've swapped out various coax and Ethernet cables to rule them out as a potential variable.
This has been an intermittent problem for months but only recently began to affect the network daily. In the past few weeks, I have received numerous notifications from Cox regarding repair work being done on the network infrastructure in my area. This problem has only escalated since then.
I expect a technician needs to check the outside coax connection(s) based on similar forum threads I've seen regarding this specific type of slowdown.
Can you post your modem's signal levels from 192.168.100.1? See here. Also, do you know if anyone else in your apartment is having the same issue? Troubleshooting in a apartment is difficult because you can't always see all the coax wiring and it can be shared with different apartments in the building. There is also finger pointing with who is responsible for the wiring inside the building but not inside your apartment.
Apologies for the delay. I am not aware of other tenants experiencing this issue.
