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Would a flexible filler help? I will try the washer trick and report back @Airhead
frankohara-
It might do but they're difficult to blend in with the surrounding area. Also depends on the amount of movement. When I've had similar problems on a ceiling under a roof it's been after roofers have been walking on it.
Sometimes helps to add some more washers/screws at new positions along the joist.
Plasterboard screws don't rust but it's difficult to find washers in the same material so you might need to use a stain sealer or primer on the washers before filling over them.
If you press on the plasterboard with your hand you might see the movement.
Airhead
The plasterboard is moving and the screws don't move so they pop a piece of plaster out. You can unscrew the screws and add washers to spread the load and try and secure the plasterboard or fill them and cover the entire ceiling with a specialised lining paper so it doesn't keep happening. Well at least you don't see it.