Freeze with flashing light

[moonwalkers]

Pro boots normally (Manjaro xfce, using zswap, chromium browser) and runs for some time.  then the screen freezes, keyboard and moouse stop responding, and the power light flasshes amber and red.

I checked the troubleshooting pages, but that is only assembly/Disassembly information with no actually troubleshooting data.

What is my Pro trying to tell me?  If it should be obvious, forgive me but I might need a pointer to the information that makes it obvious.

Not sure about red/amber, but red/green flashing light AFAIK means kernel panic.