Good advise from previous posting Restarting in Safe Mode and then put it to sleep for the 30 Minutes like before and then open it again.
What happens ? Does it connect to Internet like it should?
If Yes, this may indicate some Third Party Software is interfering with the Connection process
Download the Application Etrecheck directly from the Developer.
The application is free or paid from added features.
It will take a Snap Shot - both the hardware and software.
The Report will Not Reveal Any Personal Information.
Post back the Full Report - copy and paste - using the Additional Text Icon ( 3rd Icon to last )
We can have a look at the report for possible issues and may have possible suggestions to resolve the issues.