Why has my phone been freezing?

For about the third time this week my phone froze for 1-2 minutes. It's an iPhone
The screen stays on one page and Won't move or turn off, or change to the home screen when I press the circle button. Then a minute later it turned white with the black Apple sign in the middle and turned back on
Another time it went black while I was playing a video, and the sound was still playing

Looks like an overuse of Ram. Unistall all the less used and extra apps.

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