My ISP is Jio Fiber and I have been using a set of 3 Deco M4s for the last 3-4 years for my home mesh network. It had been working flawlessely until lately when I noticed frequent instances of "no internet" on my wi-fi network. However, the wifi from my ISPs router was working. I observed that the lights of the LAN port of my ISPs router from which  I connect to the Main Deco, goes offline for a while and then comes back on. While the lights of the port are off, my mesh network doesn't have internet although my ISPs router's wifi has internet at the same instance. I suspected that the port may be malfunctioning so I tried all other ports and stil the same issue. Then I complained to my ISP and had the router replaced. Still facing the same problem in the new router. Other devices like Set top Box, Smart TV connected to other ports of the ISPs router work fine while the port in which I'm connecting the Main Deco goes offline intermittently. Then I tried using the other Decos  as the main Deco (reset and created a new mesh network) and still the problem persists. I'm really not able to understand the root cause of the problem. As far as I understood, all the LAN ports of the ISPs router are fine, probably the old router too didn't have any issue. Something's wrong with the DECOs. Please share your views if someone else has faced a similar issue.