Is it just me who's got heavy handed mindees, or do others find that doors on ElC toys are always falling off?

We have several houses, a castle, a toadstool house etc and the doors come off as soon as mindees open them. I'm forever hunting round for them & fitting them back on.
Yesterday they played with the shape sorter bus for the first time. The door was a bit stiff to start with, but by the end of the day, it fell of at the slightest touch.

I often look for these toys at carboot sales, on Ebay and in charity shops and judging by the numbers that are sold with missing doors, I guess it's a common problem