How to interpolate only less than 3 consecutive Nan values?

I have a 500x600 matrix containing some NaN values. I want to interpolate places where there are less than three NaNs (possibly an average of the preceding, following values) and for all the other places where there are more than 3 consecutive NaN values I want to leave them as Nan values. I have already looked at http://uk.mathworks.com/matlabcentral/answers/34481-interpolate-nans-only-if-less-than-4-consecutive-nans but even the accepted answer doesn't work. (I realise this one is for 4 consecutive values but it doesn't work either way).