@DocL 

The RED light probably means the WAN connection (Internet feed via Spectrum) has dropped. Did you look at the Modem when this happens? Does it show ON-LINE?

You could have a line problem or a Faulty Modem even.

Call Spectrum and ask that they send someone to check the line and modem. The agent SHOULD be able to see the LOG on the modem too and might see something? Spectrum LOCKS the viewing of the log, or even looking at the Modem GUI on you, but they (the phone agent) usually can check it.

I assume this is the manual for your Router, https://static.tp-link.com/upload/manual/2023/202304/20230428/1910013257_Archer%20AX1800_UG_REV1.20.0.pdf

, and on Page 5 there is the Internet LED, and ORANGE (not RED) means the Modem IS connected but the Internet is not available, which means the Modem lost it or is not providing it.

  @DocL 

Thanks for quick reply.  You have confirmed my way of thinking.  Spectrum tech to come to my house today and hopefully can access modem logs. No concern regarding cell phone extender attached and in close proximity causing Wi-Fi interference?

  @DocL 

All fixed.  Service tech tested modem and it was ok.  Determined issue outside the house and replaced line from street.  Also replaced a splitter near modem.  No drops in last 24 hours.

  @DocL 

Glad it was fixed, and it IS hard to tell if there is a problem outside the house.

They can get 'aggressive' in fixing it too... They claimed I had 'poor' signal shape, so they put in a transformer to condition it. Didn't fix the problem, so then checked the line to the house, replaced that and it fixed the problem. WILL not remove the transformer though... It bothers me as if we lose power we lose the Internet, even though it the cable is live. I've got a UPS on the  route and modem and it used to be when we lost power, we still had the signal and could use tablet and phones using wireless (poor service in house). I may just take it out myself, but was 'warned' against that.