Contour starts Spontaneously after error code RDK-1000

Depends on appointment.  If it's tomorrow, I'd cancel.  If it's in the next 2-3 days, I'd monitor Contour for a few days and if okay, cancel.  I think Cox has a money-grubbing rule to still charge if you cancel an appointment under 24 hours.

After a significant outages such as yours, there were/are thousands of households with cable-boxes bombarding Cox to get back on-line.  it just took a while.