I moved into a house last April and had the living room completely re-plastered. All was well until around Christmas when I noticed a few cracks in the ceiling, 3 in the same corner and 2 in the opposite corner. When inspecting further I noticed that I could push the plaster and that it felt detached from the ceiling. I tried filling the cracks with standsrd Pollyfilla and while it appeared to hold for a while, the cracks have reappeared. There are also another couple of cracks in different areas of the ceiling. Is it a case of having to remove the plaster and have it redone? The living room has been fully decorated and I'm obviously concerned about having to redo the entire living room. Any advice about what I should do would be appreciated.