Seat Post dropping-just remove, clean then apply a bit of grease

If it continues to slip you could get carbon paste which is designed to prevent a seat post from slipping.

I would use the seat post as a torque wrench substitute because they need to be torqued very little.
Start with a bit more than hand tight use the post and if it works torque it a bit more check again until the post starts to stick and then back the screw out a bit again until the seat post does not stick anymore.

Is the post carbon too? Either way I'd remove and clean it. Do not apply grease but do apply carbon paste if available, otherwise leave it dry.

I'd definitely recommend getting a torque wrench, a set ~5nm clicky type is pretty cheap.

The anti slip paste is made for carbon handlebars and seat posts. It looks like grease mixed with fine sandpaper grit. You won't have a slip if you use that stuff.

+1 on everything said on carbon paste and a torque key. You’re using carbon on carbon, torque is critical, you could ruin your equipment. If you’re riding carbon, invest in a torque wrench, you’re set, not just having a single 5 nM setting. Don’t be that BMW owner who can’t afford an oil change.

Roge said:

Don't be that BMW owner who can't afford an oil change.

Click to expand...

That is a funny one!

Grease? You don't need grease installing a post in a carbon frame. This is probably why it slides down. I would start by cleaning all the grease from the post and inside the frame. If that does not help, use carbon assembly paste. Companies usually specify the torque for the clamp, if you think you over do it.