Yes, I have one that is a slow leaker. It is on my snow tire rim (OEM 18"). It has a tiny longitudinal crack in the aluminum stem itself. The crack is big enough to lose about 5 psi per week.
I repaired it with a little epoxy, but don't know how long it will hold up (my snow tires are off now). I'll likely have to buy a new one.
The TPMS's I purchased for the snow tires are the exact ones that came with my car and are installed on the same type rims my car came with.