Seagate Backup Plus Suddenly Read Only After Working Fine

So I bit on a good deal on a Seagate external drive for backup.  I set it up to run with Time Machine and it worked fine for months.  Then, suddenly, Time Machine could no longer write to the drive.  I can still read and recover old backups but I cannot write to the drive or change my rights.  I have updated the firmware on the drive.  No help.  Disk repair fails and my Mac tells me to format the drive and start over.
However, I don't consider that a solution. 
Any other thoughts?  I see a lot of other issues out there including for NTFS formatting but I am using Mac formatting. 

More often it isn't the drive as much as the drive enclosures.
The combination of USB2 and TimeMachine also have contributed with problems. Also more common when using 'green' drives that have their own parking, going to sleep, reducing power and putting drive into standby and then taking longer to be online. Last item that caused users trouble were the bus-powered, like WD Passport drives that do not have their own power supply and depend on USB bus (USB3 is better). 
Even WD drive cases have had trouble and problems, but not the actual drive. The corruption is in large part due to how and what happens with Mac HFS+ when a drive is not properly "safely" ejected.
I would be careful with name brand enclosures. Some WD enclosures built the case into and around the drive, the drives are not removable... at all.
You might want to source a drive case on Amazon or elsewhere or OWC www.macsales.com which do allow swapping out drives.

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