iphone 12 having major issues.

for context, ive had my iphone 12 since july of 2023 so i really shouldnt be having any issues. However, my phone will randomly restart for no reason, (at least 5 times a week) my messages wont send sometimes and im not receiving messages, sometimes my phone will enter this glitched state where i cant open apps, turn it off, or even restart it. i have no idea whats wrong but its been going on for the last few months and my phone has become nearly unusable.