If you see lines reading "Adding X bad clusters to the Bad Clusters File" or "Windows replaced bad clusters," your drive is physically degrading.
I notice you've written "chkdsk x f r" — this looks like a command, likely for Windows (Check Disk). chkdsk x f r
If you need me to explaining chkdsk /f /r (on drive X:), here is a structured outline and content you can use or expand. If you see lines reading "Adding X bad