@jzchen
Thanks, but that didn't fix it.
After everything I've done, it keeps coming back to Spectrum and their stance that tplink doesn't work right with Spectrum. This after burning through all of the troubleshooting steps on the deco website, after changing modes and settings and trying each unit as the 'main' unit, no matter what seetings I've tried based off the forums and some digging on reddit, and after having spectrum service show up at our house and confirm their system works fine but still tried a new modem just to shut me up. Plus 3 trips to best buy for ethernet cable to try connecting my wife's office with a new cable, replace the deco cable that came with the deco router (per deco tech support) plus 2 more cables to try connecting the satellites directly (reddit)
After all that, here's what I have:
Old modem, old router (dbit): Everything works, range is bad.
Old modem, new router (deco): Everything works (but not raspberry pis) but constant signal loss and requests to re-login form all devices. 1 satellite works the same, the other one is almost always red.
New modem, old router (dbit): Everything works, range is bad.
New modem, new router (deco): Nothing works, only red light in ap mode or router mode with or without cloning old router mac address.
New modem, new router (spectrum): Everything works, just plugged it in and it stated working. No connection issues. Lousy range.
New modem, new router (spectrum), new router (deco) plugged into new router (spectrum): Green light in ap mode only, frequent connection loss for everyone connected to the deco wifi or wired connections.
New modem, old router (dbit): Everything works, range is bad.
New modem, new router (spectrum), old router: I haven't bothered trying.
App settings I've tried:
Guest network: disabled
IoT network: disabled
Network optimization: Tried it a couple of times. Force closed it the first time after about 5 minutes, after over an hour the second time. Just a spinning blue radar screen. Maybe this not completing is the issue?
Test internet speed: 942Mbps
Operation mode: Currently access point, just so it gives a green light. Router mode only gives a red light.
Wireless network mode: Stable mode "Ultra speed mode" behaves the same as stable mode.
Smart DHCP: Currently Enabled, but same behaviour if it's turned off.
Fast roaming: Diabled (no difference if on or off)
Beam forming: Disabled (no difference if on or off)
Satellites - Currently off, but frequent connection drops when we were trying to use them. Didn't matter if hard wired or wireless.
I have several raspberry pi devices, none of them has ever been able to connect to any deco. They connect and then time out on any wifi access.
Spectrum said tplink has issues connecting to Spectrum. This from an on-site technician who tried multiple combinations of hardware just to ensure the modem is not the issue.
Spectrum followed up with an email of 'approved third party hardware that works on spectrum internet' that does not include tplink or deco.
Deco phone room support said I need to follow the 'special' instructions, but the call qulaity was so bad I don't think he got the email address right, so I still don't have those instructions. However, nobody else from tplink or deco can provide me with that specific set of instructions. Maybe this is the problem.
Sorry for the lengthy reply, I've explained this setup mutlipe times and in several forums (here and reddit and a few emails) so I'm just going to copy paste this as a "here's where it is."