I can't say 100% issue is two same IP address for teo different admin pages. I have set for DSL Modem default IP address 172.16.0.1 but for TP-Link router in AP Mode 172.16.31.4. They will not...

@LS321 why you want to disable MLO? Anyway Wireless > Wireless Settings > Scroll down MLO Settings and uncheck mark to disable it.

@LS321 BE900 V1 don't has and will not get MLO feature.

UPDATE! | I found what couses router unstability. I turned off all devices and I turned on one by one and let to work for 20min, till started rebooting. And fortunately I found quickly. It is Nokia...

Ok, I'll look what I can do. Reset device and reconfigure. But absolutely this is nightmare. No Eco Mode isn't enabled. I have set on normal.

@Kevin_Z So I turned off device and turned back on. And still negative feedback after latest update to v.1.1.1. Router goes like disconnecting or restarting self. This happen so often after latest...