Did my phone possibly got hacked….?

Sooo…I downloaded red note today and everything was going well until my phone ended up acting weird. For instance, my 5G was turning off and turning on. And then I was scrolling through tiktok when I randomly got a face ID recognition for no reason…ummm? What should I do?? I deleted my account and then the app, but how do I know if my phone is okay…?