This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
Yes. It indicates the plastic may be becoming brittle and that supports
behind the panel are weakened or broken. Some 'springy panel' users report
pressing on a switch and poking a hole in the panel!
Prolonged exposure to sunlight and/or long exposure to heat from the GS
are the usual causes. Preventative measures are to keep your GS away from sunny
windows and to increase airflow through the System Saver for hot running
systems. The easiest way to achieve the latter is to swap in a fan with a
higher cfm rating. (See fans listed in the previous answer.)
Panels which feel very springy should be reinforced. Open the case and
used epoxy to reinforce panel and switch supports.
 
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