What should I do if the Power LED on my modem router is solid red?
A solid red Power LED indicates thermal cutoff mode, meaning the device is overheating. Power off the modem router, let it cool down, and move it away from heat sources such as TVs, DVD players, or speakers. Keep the device in a vertical position in open air to prevent overheating.
From the official Netgear CAX80 Modem Router manual, page 11
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