Hi Mate, What's the model nubmer? Is it Archer VR600 V2? Who is your internet service provider? How much bandwidth given by them? What's the speed you can get from the router? If only wireless have...

For the Ip changing issue, you can try to simplify your topology and only connect your modem to your deco and reboot the the deco and see if the IP will change or not. Guest wifi is using the same IP...

Yes, it has the function to disable 2.4G and 5G seperately now:)

It might be caused by the unstable network connection , are you sure the internet from the modem is stable, is there any internet issue? What's the wan IP address on your No-IP page? Can it obtain a...

Hi 180511 is for EU version, for US version, the latest one should be 170627.

There will be no problem.