If you are switching between cabled and wireless internet connection you might run into this issue when hibernation in between. The wireless is disabled when hibernating when having internet cable plugged in. When you start up without internet cable the wireless won’t connect automatically and will just show a red cross, being disabled.
To solve this one way is to press the icon and “Troubleshoot”. Now it will run the troubleshoot and hopefully find the issue and solve it.
“Problem with wireless adapter or access point” Fixed.