Brother MFC-L3750CDW - baked flakes of toner on printouts

Jan 9, 2021
Hi guys,
I have a strange issue, Half a year ago I have bought a new MFC-L3750CDW LCD printer. A month ago I installed a compatible Yellow toner cartridge, everything was working perfectly well up until today. I sent a bunch of documents to the printer and in the middle of the printing - the quality of the printouts deteriorated severely.
On all the printouts I got "baked" flakes of toner, the color of them is usually red-black, some times a bit green. I've attached a proto.
I haven't seen such issues before and couldn't find anything similar on the internet.

Does anyone know what can that be and how to fix it?
I'm thinking to contact Brother's support, but would like understand a bit more about the problem before that.
Thanks a lot in advance!


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