Hello, I'm new to the site, so haven't looked through all of the threads yet - this may have been covered before, if so can someone point me at the thread

:
I've got a
D300s, about 18 months old (thinks it's out of warranty by now), 6500 activations - never dropped, well looked after. Recently I noticed that the multi selector wasn't always responding in moving either the focus selector (it was unlocked...) or scrolling through the various review screens. This was an intermittent problem and annoying enough, but within the last month or so other review buttons are starting to play up - most noticeable the image review, but some of the others as well. All of the command dials and other controls work fine - just seems to be the stuff around the rear LCD.
I've not updated the firmware yet - although I doubt this'll help.
The camera will be going in for repair, but before I do this - anyone had similar problems, when fixed will it recur, how much did the repair cost?
Thanks.