Incoming call number was hidden, sometime disappear incoming call although phone ringing .

Dear Hmd ! My phone had some error when incoming call: 1. Sometime incoming call number was cover by blank windows .

Incoming call number was hidden, sometime disappear incoming call although phone ringing .

N.Trung N.Trung
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Dear Hmd !


My phone had some error when incoming call:

1. Sometime incoming call number was cover by blank windows .


2. Sometime, phone rang and Android notification show message 'The phone app using battery' (I don't remember exactly words), afterwards incoming call button (answer, reject) disappear while phone still ringing. 


Please help me check and fix this.


Thanks.

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