Can anyone tell me if just one screw loosening on the classic is normal? I’ve had mine for about a week and keep noticing one of them loosening slightly so when I push the halves together it makes a clicking noise. When I tighten the screw a bit, the noise goes away.
No, this sounds dangerous. In the beginning this might be normal; you are supposed to check every fews days. If this persists rush to your SA to have it checked or even replaced to the new system. I nearly lost 2 of mine because of that.