How to Fix Slow Wireless Connection After Waking Up Intel® NUC Kit from Sleep

The wireless connection becomes slow and unstable when waking up the Intel® NUC Kit from sleep mode. Furthermore, the Wi-Fi connection mode changes from AC to N, and the speed drops significantly.

1. Check if the wireless card cable is properly connected by opening the chassis of the NUC and locating the wireless card. The cable should be securely plugged into the card and the antenna. See the Integration and User Guides for Intel® NUC Products article for instructions on how to open the NUC. 
2. Update the BIOS to the latest version. 
3. Perform a clean install to avoid driver conflict with older versions. See Clean Installation of Wireless Drivers
4. If the issue persists, check if the network configuration for the router or client needs to be adjusted.
5. Try switching to 5GHz or 2.4GHz bands, if possible.
6. Set the correct wireless standard (802.11a/b/g/n/ac/ax) following the instructions in the article Advanced Intel® Wireless Adapter Settings under Wireless Modes. Contact the router manufacturer for assistance with router settings.