LEGO

I have a problem with my International Space Station 21321 set, all the blue clips that hold the panels to the main beams are crumbling, and weakened enough that I wake up to panels on the floor. I have no idea why this is happening, but hoping someone can help? Ideas I can do different to prevent it after I replace these parts? It seems to effect all the blue clips not just the big ones, even the little pod lost one of its solar panels :(

Some details, it's probably 4 years old now. I keep it on display but not under glass, in a 72f room. I have difficulty keeping it totally dust free as it's very fragile to begin with, but it's never really been touched otherwise.

Thanks for any ideas

Edit: not the technic connectors, the blue solar panel pattern tiles are the problem