I started getting it recently. It started 2 updates ago and my phone wasn't charging. After the last update, a few days ago, I still get the message but it charges. I think a big part of the issue with this warning is that it will send the notice of it detects a second of weak charging and it stays as an active notification until you clear it. Mine will still say it after unplugged. This makes it so one moment of issue gives the impression that there's an issue with the entire process. It either needs to deactivate when the issue ceases, or it needs to become better at differentiating between an ongoing issue and a blip that randomly occurs. My Note 9 has not struggled to charge or hold a charge, yet I see this message daily.
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