capacity showing but appears full

Hi, any assistance for this ageing, non-tech-minded Clip-owner appreciated - when I load tracks via Windows, the Clip is showing 490 mb capacity remaining ( more than half its total), yet it wont accept any more tracks, so I can’t more than half-fill it; it’s been incrementally increasing this amount for some time, & I’ve formatted it, to no avail, can anyone suggest a remedy ( In non-tech-terms if poss ) that this oldie can apply? Thanks for any help.

Hi, thanks for responding, yes I did that, & tried to reload with several CDs worth of music, & it stopped loading with 490-odd mb still showing as available - anything else I can try?

Thank you very much Miikerman, will give that a go.