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If the problem occurs after a while I'd say your edge is breaking down or the slurry is not dealing with the amount of swarf created.
Just bear in mind if you do break off bits of edge they will be...

Does your Suita have a 'holey' surface. If so could it be metal particles getting caught in them ?
If you're spending one hour on it, I would imagine heaps of swarf in your slurry.
Do you really...