Turn off notifications for lock screen

Hello. I have an A51 5g and I am having issues with the USB notifications. The USB works fine, but I get constant notifications that the connector is being connected the disconnected. Every time the notification alerts, the black screen (sleeping screen) wakes up my lock screen wallpaper. So basically, my screen never goes to sleep = drains the battery. I cannot find a way to turn off notifications for the USB. I see an option, but it is greyed out.

- I have cleaned the port
- I have done a factory reset
- I bought it to the local fixit shop who said I need a new USB port.

If anyone can tell me how to turn off the notifications for this, I would be SO happy!

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Hello/ very intresting

Thanks. Notifications on screen are distracting me at works, like all the times. Especially notification from social apps like Facebook, Instagram...
Your post really helps me out!

Thants interesting