Why does my door keep moving?

I had a new front door fitted. It is a solid wooden fire door in a block of flats. 5 weeks after it was first fitted, it moved in its frame and it was sticking badly in the frame, so I had workmen come out and shave some off so it would not stick anymore. That was 3 and a half months ago. Recently, the door has... show more I had a new front door fitted. It is a solid wooden fire door in a block of flats. 5 weeks after it was first fitted, it moved in its frame and it was sticking badly in the frame, so I had workmen come out and shave some off so it would not stick anymore. That was 3 and a half months ago. Recently, the door has started hitting the frame again, and I fear that it will get worse and start sticking in the frame again. Why does this keep happening?
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