The front parking lamp grilles on my '79 TA are doing that..weirdest thing I thought...luckily I just bought a new pair cause I got tired of wiping the crap off that kept building up on them.
On my GN, I just came out one day and the rear fillers were laying on the ground in pieces..just fell out while sitting up...fronts did the same thing a few years later...and this was on a 50k mile car thats been garaged kept its entire life!