Hi I have had the same problem in the past, and every time I patched it up and repainted the cracks would come back. You soon realise that you are just throwing your money away.
Its always best to sort the problem, so I learnt to plaster. I reckon iam as good as anyone at mudding over the walls but I am not to confident about ceilings.
It’s a lot of fun and ihave done the kitchen walls for a male friend and two bedrooms for my sister.
I learnt from a video that I downloaded from a website http://www.grahamvideos.co.uk
Re-mudding isent for everyone but I am sure glad I learnt.
Hope this helps