Why does my screen go black, Am i being hacked

chucknsusand ~ Does your iPhone 7 still have its original battery?

Also, what's the Maximum Capacity % here?...

Settings > Battery > Battery Health

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chucknsusand wrote: " yes origanal batterie"

Have the battery replaced and all will be well:

iPhone Battery & Power Repair

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chucknsusand wrote:

Is my phone safe ?

There is no hack for a non jailbroken iPhone.