Same issue with my note 8, in fact if I use the OEM, or an aftermarket fast charger it says slow charging, my phone has somehow gone from fast charging to slow charging. On a regular USB it seems to charge normal. It would be really nice to have my fast charge back. I've tried a few of the "fixes" listed here and mo difference, I'm also thinking it must be one of the updates that messed with the fast charge. I'll try my Tab S3 as I think it also has stopped fast charging.
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