Spontaneous battery drain


Feb 25, 2020
First of, the battery now drains about two to three times faster than before.
The big problem however is that the battery level spontaneously goes from three quarters full to flat in about five seconds. The phone shuts down and won't reboot because of low battery. When I the recharge it the battery level goes from flat to fully charged in a matter of minutes.
Stock Mi A1 with all the updates ... This situation suddenly started about two weeks ago. What on earth is going on and how do I fix this?

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