Sometimes apps stopped
Please can you provide more specifics?
If it's mainly Google apps, please check out the suggested fix in the following thread:
If this doesn't help resolve your current issue, or it's not mainly Google apps, please revert here with more specifics.
Go to play store disable auto updates uninstall android system webview
And reboot your device
All about OxygenOS – July 2021
by Gary C., 2021-07-30