Phone battery jumps from 80-90 percent up to 100, and returns to normal charging after soft reset?

Hi there, I recently purchased a Lumia 950 XL a couple of weeks ago. Ever since day one, it s had a habit of skipping to a "completely charged" unless I soft restart (regular restart won t fix it anymore), then it charges normally for about a day or so. I ve replaced the battery and tried different chargers. Any advice? These devices don t come with a warranty since they re unlocked. :( Thanks, Kenny

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