.......the GFCI in question clicks softly and randomly about every 20 to 60 seconds. It doesn't trip it just clicks. Then every 30 to 35 clicks it will trip.......

Anybody experienced this?

Checked the wiring OK.......

Checked the downstream device OK.......

Checked the breaker OK......

Is this an internal test?

Any feedback on this welcome and yes I know I can replace it and see what happens, I'm trying to find out why it's clicking.