Please use the search function. For many of your problems threads already exist and some have solutions, others have workarounds.
I’d guess that’s a permission settings issue.
Does it switch off or reboot?
This is a known issue with the proximity sensor. Just clean the glass in front of the sensor and then go to Settings > Maintenance > Proximity Sensor and follow the instructions to recalibrate.
Do you mean the home screen icons or the screen itself? Maybe a screenshot could help.
Charging issues are common too and are usually solved by using the right charging equipment.
If they don’t answer your support request within a reasonable time frame usually something went wrong and it’s best to call them.