My mobile shut down suddenly!!

I have Samsung galaxy s3 mini VE .. I have a problem gone me crazy

My device was working great for about 2 years but nowadays the battery start to be less efficient and drain much faster and i was planning to replace it .. But since 2 weeks the device begin to shut down suddenly even the battery not empty

I tried to re-calibrate with many apps but the problem still persist .. I notice this problem occur when using mobile data and the device keep shut down until i turn it off or plug into charger

Please help me to solve this problem

Note: attached photo of battery chart display that mobile shut down at nearly 90% !!!

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