My deco turns occasionally to red and during that time no internet is available from deco eventhough my main router is having stable internet conbnection

i have connected decos both wirelessly and wired same problem repeats

the redlight stays on fr about 2 mins and then again connection is restored and green light comes back and the cycle repeats

I have done resetting of decos and main router multiple times and the problem still persists and i have tried both accesspoint mode and modem mode

somebody please help      I have added the video of the same

Redlight issue video