Just had this happen
My daughter was on the freeway with cruise on. All of a sudden, cruise turned off, cruise light flashing, CEL on and traction control light on (showing that traction control was off). Down about a third on the gas guage.
Subaru dealer looked at it, lights had gone off prior to testing (was on when I arrived at the dealership).Code was P0453 evaporative emissions system pressure sensor high input. No specific problem evident at this time.
Service advisor said that the system will reset itself after maybe 19 miles, and if it happens again and if the vehicle appears to be running fine, to let the lights reset themselves and only come in if it happens many times.
$58 charge as the 2009 Forester has 42K+.