M4 in AP mode with ethernet backhaul causing network crash
I've had two Deco M4 for a little over a year. Was a HUGE improvement over traditional router and worked great in AP mode, behind a Linksys router. Both with ethernet backhaul back to router.
Switch ISPs and replaced the modem and Linksys router with a single unit. Same exact set up with ethernet backhaul to the new unit. Both M4 continued to work flawlessly for a week.
All of a sudden, keep dropping off the wifi network and struggling to reconnect. When I do manage to connect, the speed is horrible and regularly says no internet connection. Try multiple devices and get the same results. After MUCH trial and error and what not, it turns out that the secondary M4 unit keeps going to blinking red lights whenever the ethernet backhaul is connected - as if it's an invite loop.
Its important to note that;
- the new modem/router's wifi seemed to be OK when the decos weren't
- when the second deco was unplugged, everything worked fine
- I reset the secondary unit twice and continue to get the same results (red blinking lights and bad connection) after the ethernet backhaul is plugged in
- everything works fine when second unit is using wifi only
- new modem/router is a Helix Fi from Videotron (Canadian ISP)
Any ideas here? No updates to deco or helix in the day leading up the the issue. Or my thing that happened the night before was setting one Ring camera and then unplugging it.
I read something about a protocol used in D-Link switches being an issue. Could this be the same problem I'm having? If so, could it be intermittent (1-2 weeks after hardware change)?
Thanks in advance!