Wrong battery percentage MacBook Air M1 with various stop

Hi, I'm having a lot of problems with my new macbook air m1 256gb, bought about 1 month ago. (if I load the pc for a while, this anomaly takes longer to manifest itself). In any case, I start with the pc that has 100% battery charge, despite using it, the pc remains at 100%, subsequently in a time between 5 minutes and 2 hours depending on the case. The pc goes to sleep and then turns on again for example with 5% battery, if it turns off it connects to the current and turns on again it returns to 100%. To summarize, sometimes in the space of a few minutes the pc leaps from 100 to 5 to 95, etc .... At the Genius Bar they still do not detect problems in the diagnostics I also did the firmware restore