I've finally picked up my first Subaru, and so far I love it. Apart from the door mirrors. They flap about! The whole unit moves when it shouldn't, it's annoying especially on the motorway. Any ideas?

!Removed! irritating isnt it. sadly i liked the car too much to walk away when bought it from subaru they said it was fine and no movement, checked by their technician apparently.  i saw somewhere online saying there was a fix by changing the bolt type inside the mirror but subaru cambridge told me it there was no such thing.