Or, you could just try what two experienced users have suggested.
Oh oh. You had to go there, Pondini?
TM isn't resetting my drive to read-only, you made that up. Then, you have the nerve to go and suggest my drive is about to fail. Why would you jinx me like that, Pondini?
I read and evaluate ALL the advice you give to forum members. Why wouldn't I? You are the most vocal people here. I respect your badges and your experience. You spend countless hours of your own personal time helping thousands of nubes and Windows converts resolve their problems and that's great and all...
But, I want help from the person a Level 7 goes to, Pondini. Nothing personal, nor am I challenging you or your knowledge but quite frankly your TM advice is fundamentally basic common Apple-sense. ... cause Band-aids stuck on me.
Disk Utility, or any File system utility for that matter, is not going to resolve this issue. The drive appears to be ok, is not necessarily so.
This TM problem is a gathering storm. Google this Read-only issue! It's everywhere and not just here in this Apple forum.
The bottom line is, we have to manually resume Time Machine backups every time TM fails and it's becoming annoying. You've been dealing with this matter for months and your advice is always the same; run DU or DW, which are File system utilities, and when those fail to affect any permanent repair, the fix is never positive.
This issue is beyond the scope of this forum and won't be resolved until an Apple engineer gets involved. It's about time Apple began collecting data from our Macs regarding this issue.
Perhaps ZFS is the answer to my problem?