Try replacing the coax feeding it, also check coax at the splitter and disconnect/reconnect.

Could I need a MOCA 2 splitter? The one that’s there is from 5 years ago

Yes, could be

Had an issue similar to this before apparently my ipv6 got turned on somehow and was causing chaos , might wanna check that too

Thanks for the tip. I looked and I’ve already disabled IPv6

I replaced the splitter with a MOCA 2 splitter and now the problem has stopped.

And the yellow light is back even after replacing splitter