First of all please don't double post the same thread! It means I waste my time reading and deleting the copy.
You problem is almost certainly caused by the PVA glue cracking on the joists.
This in turn is probably due to excessive deflection.
Who has told you the joist centres are closer than the NHBC minimum?
Timber frame floors can use various types of joist from solid wood, to TJI type "I" joist to composite "Posi" Joists.
Each type will have a varying depth and/or thickness and will be designed depending on the span of the floor.
Longer spans require deeper joists and/or closer joists centres.
Steel beams may also be required in some cases to reduce spans.
If you can push up the ceiling to recreate the noise you have a problem with deflection.
Contact both the house builder (which was who by the way?) and the warranty provider and ask for them to inspect the floor.
Timber frame floors can come in cassettes, completed sections of floor complete with boarding. In these cases it is unlikely that an detail will be wrong, unlike floors constructed on site with loose floor joists and boarding.
To cue the "popping" fixings to the ceiling boards, use additional plasterboard screws and remove any popped nails or screws. Note this alone will not cure the noise problem!
