It all of course depends on just how high the temperatures are but it is certainly a concern.
I don't think that glue will usually be an issue as basically the glue has become fused with the plastic and behaves as a single material.
The main concern will be that the plastic will become softer as the temperature increases. This could lead to warping of some large items,such as hull or fuselages, or deformation of small detailed items such as ships masts etc.
I would certainly check up on them if the attic temperatures are getting very elevated and would consider moving them to a cooler place if the plastic is getting hot or maybe put a fan in the area to keep the temperature down a bit.
You don't want to leave it until you see any damage as it will almost certainly be too late to do much about it by then.



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