I’ve moved your post to this topic, as it shows a number of similar problems. In general it appears to be a sign that the battery is beginning to fail. First check for battery deformation (do a spin test if unsure, see here). If there are any problems with the battery, and your phone is less than 2 years old, support may provide a warranty exchange, see here. If the phone is older, a new battery can be purchased here or via distributors (the latter especially if you are in Switzerland).
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