1) - Have you tried a different usb port on our Mac
- Have you tried a different usb cable
2) - Sony SD card could be your problem with real time to slow motion. I don't see Sony brand on gopro list of SD cards they recommend and tested. click on link to review https://gopro.com/help/articles/Block/microSD-Card-Considerations
3) -Make sure your GoPro Hero is update with the latest software. And click on the link to troubleshoot the wifi connection with could be the problem. https://gopro.com/help/articles/Block/Wi-Fi-Remote-Update-Troubleshooting
Hope this helps you.