I've been using the M5 decos as AP for almost a month without issues, yesterday they got disconnected (Red lights), the modem had internet connection via ethernet so it wasnt a ISP problem

The decos are connected to the isp modem via ethernet, they are in diferent rooms but not too far away from each other (im using 2)

When i restart the main deco it works perfectly, green light, full speed, but when i connect the secondary deco the light turns green, after a few seconds its starts blinking red, and then static red, after that the main deco gets red and loses connection, the only way i can have internet again is unplugin both of them and connecting just the main deco, it was driving me crazy yersterday, i tried conecting the main to the modem then the secondary to the main via ethernet and it didint work either

i hope someone can help