Constant warning emails

Since updating (deleting and uploading files) to My Cloud Home yesterday, I keep getting warning emails (every 5 minutes) saying that My Cloud Home is filling up. The content of the message says that my device has 483 GB remaining so hardly necessary to be warned of it filling up.

Have tried turning off notifications everywhere I can find somewhere to do that but not managed to stop them.

The only thing I haven’t tried yet is to disconnect/switch off the drive for a short while.

Any ideas on how to stop this?