Deco M9 Plus fails, but it still shows the solid green light
So, got my first real issue with my Deco M9 Plus network.
My computers started to lose internet connection, without any indications elsewhere in my network. All 3 Decos with solid green control light. After several hours with debugging and check with multiple wifi units, I have concluded that one of my Decos lose connection with the rest of the Decos, so my computers are connected to a wifi without internet connection. However, the 2 other decos are connected to internet, and I can verify that by unplugging the electricity on the malfunctioning Deco. Then my computers jump on to another Deco within reach (however with marginal wifi signal) and connects to internet.
When I plug the electricity again, also the malfunctioning Deco connects, and also provides internet to my computers and any other units. However, after less than 1 hours, it fail again, and provides wifi without internet. As the wifi is up running, the computers do not switch to the other deco because the are already connected to wifi...
I have re-started several times. I run the last firmware upgrade. What can I do?