Hello together

I have my Deco M9 in combination with the UPC Sunrise Connect Box 2 (I think a UPC product).
When I configure the Deco as a router, I constantly lose the internet connection and sometimes the connection to a Deco.
In Access Point mode, the whole thing works perfectly. Can anyone help me? (I would prefer router mode)

Question

Hello together 

I have my Deco M9 in combination with the UPC Sunrise Connect Box 2 (I think a UPC product). 
When I configure the Deco as a router, I constantly lose the internet connection and sometimes the connection to a Deco. 
In Access Point mode, the whole thing works perfectly. Can anyone help me? (I would prefer router mode)

Answer

I have the same setup in router mode, provided your box is also the "narrow" one and not the more square one (https://upload.wikimedia.org/wikipedia/commons/thumb/2/24/Connectbox.jpeg/800px-Connectbox.jpeg). Have you updated DECO and tried factory-reset? To find the error, can you connect a device directly to the modem via Ethernet the next time you lose the connection and see if that works?

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