[Loz]

I get a slight stickiness on the front brake of my 2003 999S. This always frees off after a couple hundred yards, but I will be monitoring even closer now after your experience, Twinfan!
I spoke to my dealer at the last service - a bit of copper grease on the brake pad pins was apparently the answer, but I have not done enough miles yet to confirm that this is the answer in my case.
If there's more to tell in the future, I'll be sure to mention it.