apps are frosen

• Restart the device. That's it.
• Still not solved --> Force restart iPhone - Apple Support

• Follow the Apple article to resolve the issue --> If your iPhone, iPad, or iPod touch won't turn on or is frozen ...

charlotta ~ Does your iPhone 6 Plus still have its original battery?

And, if the apps become unfrozen, what's the Maximum Capacity % here?...

Settings > Battery > Battery Health

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