It could mean that the clutch plates are worn out or damaged. Id also check the solenoid packs. Gears slipping out can usually be fixed by replacing the clutch.

If what is slipping out?

Not concentrating. Focus.

Have you tried turning it off and on again?

You don't shut the door quickly enough.

Could be a synchronization problem. Adjust the timing chain.

If you’re talking about sex you are making to long of a stroke or your not hard enough, maybe even a member that might be a little too small.

Zipper broken

You stripped the gears.

You need a stronger zip to stop that happening 😂

It’s not secured properly

It's too small.

there won't be a second date

It has better things to do?

too much wd40, use moar duct tape.

It is too short
It is too narrow
It slips when the target moves
It is moving
It is supposed to do that

oh ffs try a different angle

You're unzipped.

You need to take another 1/2 of viagra.

You're to small or its too large

Too floppy. You need a couple of blue diamonds.

she’s too wet