My iPhone display is dazzling and restarting continuously

Your battery may be at the end of its life.

Batteries degrade over time with usage due to chemical aging.

You can expect about a 1% drop per 50 charging cycles (25 charging cycles for IPhone 14 and older) with average use on an iPhone. This is an approximation, that is why it may be plus or minus a few percent on a month to month basis.

Apple recommends replacing it when it reaches 80%. To check your battery health, go to Settings > Battery > Battery Health.

iPhone Battery Replacement.

iPhone Battery Replacement - Apple Support

About Lithium Ion Batteries

iPhone battery and performance - Apple Support (IN)

Try a forced restart, but you’re likely headed for a discussion with Apple Support around diagnostics, and repair or replacement. Whether this is a failed battery, or something else?

• Force restart iPhone - Apple Support

• Contact Apple Support - Apple Support