Contact LEGO support and tell them of your problems. They will usually send free replacement parts.

In my experience, the pieces that use the clip connection can sometimes become weak over time. I had one particular shelf with clips of various sets and ages that for some reason was heavily affected by the clip elements weakening in grip strength or just splitting in two; there was a bathroom with a shower on the other side of the wall, so I speculate that the humidity could have been the cause but I really don’t know. This shelf also didn’t get much sunlight, especially compared to other shelves without as much of a problem. Is there any possible source of humidity by where these clips have been weakening/breaking the most?

So there's lots of good advice here for actually solving the problem, but I'm going to propose the alternative:

This is unironically the current state of the ISS, and maybe it's worth it to let art imitate real life in this case, at least until it deorbits next(?) year.

honestly I'd just say get replacement pieces from Lego super easy to do if you say that they broke or whatever. I got a buch (25 or so) bricks for free because all the brown bricks kept cracking when disassembling

There are what? About a dozen different plastic types Lego uses? There might be a batch of plastic that was used that is slowly shrinking over time from off-gassing. (Typical bricks are ABS which don't have that particular problem.)

There might be a defect that someone else is aware of, but you might need to replace the connectors or glue them. Heck, you just need to fix the friction fit so creative use of PTFE thread tape might work.

(Not a Lego expert, but I do my research into plastics and such for other reasons. I want to guess that it might be the POM (Delrin) that is causing the issue which is absolutely not approved for use in spacecraft.)

Edit: Clarification on the PTFE thread tape use. For those who are unfamiliar with it, it's not sticky and does not have any glue on it. If anything, it's going to be a bit more slippery than other plastics. If you had two bricks and put a layer of PTFE tape between them, it's would be thin enough to act as a wedge between the bricks to fix a friction fit but you should still be able to pull the bricks apart easily. You would need to experiment though.

I've had mine wall mounted for years now and haven't noticed any issues with it. Maybe your pieces were from a bad batch? LEGO has had issues in the past with certain colors becoming brittle and crumbling but AFAIK this is mainly on brown pieces.

Is it stored in direct sunlight? Blue absorbs more UV than other colors so it might be damaged more quickly by the sun than the other blocks.

I feel like you need to @ Nasa on this

Seems like the panels are getting damaged due to cosmic rays. Needs more shielding.

You could always contact Lego. That seems like a problem with the production run or color.

And while somewhat blasmephous, if it's a display piece, you could consider glueing the things.

I've heard rumours about blue pieces being brittle. Maybe you can switch to grey pieces without spoiling the look