Asus RT-AC88U disconects internet with d'link switchtes since today

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New Around Here
Dear Merlin and experts,

I have been using your firmware for years now.
Since today I have a very odd problem.

My asus RT-AC88U with Firmware Version:384.17 is my main Router.
Asus RT-AC66U X 2 are on AP mode.

Since today my internet disconnects with all my 5 D'link switches (tested each one seperatly to rules out a broken one)

First i reset my main router and disconnect all other AP's and switches.
Then Main router is back online, i plug in cable to D'link switch (tried every lan port on router and switch) and my internet is gone.

Well i found that out after hours searching.
Then i put a netgear switch behind my main router and my internet/network is back.

So i start buidling up my AP's and switches.

AP's all work and still have my network/internet so am glad but....

From the moment i connect one D'link switch the internet/network disconnects.

I have never seen a problem like this.

Do you know or any else what the problem can be?

Thx in Advanced

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