I believe there's also some sort of run timer or distance measurement for how far the actuators pull the brake cables. I had this consistently last year and ended up the parking brake shoes needed to be adjusted. Spun the adjuster out so the shoes barely scrubbed the drums and it went away. I still get it every now and then but when I do I feel/hear the shoes clicking cause they didn't release properly. ALso most e-brakes lock/bind when moving in reverse so if you park on an incline with the nose up and reverse from your spot that could do it too.
My procedure when parking is so hold the brake, put in park, hit the parking brake and once I hear it stop I release the brakes. Car barely rolls and I know the parking pawl isn't being stressed.