My iPhone keeps turning on and off

my battery is 77%

That is the problem. The battery should have been replaced 3-4 months ago.

You can find a list of authorized Apple service shops in your area using this link: Find Locations

About $90 (U.S.)

Rachaelevin ~ What version of iOS is your iPhone 12 running?...

Settings > General > About > iOS Version

Does it still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health

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can apple force restart my phone

You....can Force Restart your phone. But, it won't fix the real problem.

Force restart iPhone - Apple Support

ios version16.6.1

my phone is a iphone se 2020 or 2022

i have the original battery

my battery is 77%

do you know what my problem is

can apple force restart my phone

serial number GWVHJ9U6PLJN

model number MHGF3LL/A