@Myopic I HATE to say this, but there is an OUTSIDE chance this is an early warning that the CLP/SSM is taking on damage from water intrusion. I REALLY don't think so, but we've seen a lot of issues with water getting into the right rear well or the lower trunk from various sources.

You MIGHT consider pulling the CLP/SSM out and unplugging every connector - do you see moisture? Green or white corrosion on any connectors or connector pins?
If so, I'd find the source of water instrusion and start looking for a replacement CLP/SSM and the last 2-3 feet of that wiring harness. NO new parts are out there, ya gotta find a "parts car".

Just an outside thought....