file does not exist is an error that shows your node lost the piece. You can check your dashboard and if your audit score goes below 60% then you get disqualified on that satellite.
How is your HDD connected ? Is it a Windows or Linux setup ?
If most of failed is GET_REPAIR, then it could be because you has lost or corrupted a pieceinfo.db database some time ago.
If you see those errors for every download request, then your pieces are really gone and this is concerning - you should check your dashboard or request a storagenode API for audit score: Script for Audits stat by satellites