I had them come out and 'repair' mine within the year of the Warranty. They simply slathered a thick layer of flexible mud on the cracks, painted it, and left.
Of course the cracks came back and they are now on top of a thick layer of added on mud. It is worse than before.
I think that you really need to sand down the texture, wet all the joints, pull off the tape, re-tape with mesh tape, re-mud, re-texture, and re-paint.
No easy answers.
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