Ceiling coming loose

Hi ppl, the walls aren't crashing down, but, there's always a but:no:. In sections of our home the plaster is coming adrift, have been told you can lay plaster bandage? inside to resecure it? have no idea, how these are put up etc, on inspection I can see the undulations, it is a large area, hope to be able to secure it without large expense, all DIY if possible, money is,,,,, sheesh what money:)(.
Any tips on restoring this celieng would be gr8. house is around 26yrs old.
Many thanks
Waz


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