Loose joints can be fixed by putting floor polish/nail polish into them to stiffen them up.
I would've recommended Futures Floor Polish but apparently that is now discontinued.
The good news is the modeling community is recommending Holloway House Surface as a replacement. I haven't used it so I can't say but if you're willing to try it you it may fix your looseness problem.
https://jonbius.com/2023/02/01/a-rep...0like%20Pledge.