The Mi 10 suddenly changed from fast charge to slow charge possible reasons are as follows.
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1. The slow charging of the mobile phone may be the damage of the data cable or charging head, and it is recommended to replace the fast charger.
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2. It may be that there is a problem with the mobile phone system leading to the fast charging protocol not being started. It is recommended to update the system or go to Xiaomi Home to continue after-sales maintenance.
Generally speaking, a sudden slow charge is a failure of the battery. Can check to see if a new battery is needed.