Hi anton27,
You may try disabling the Bluetooth device and test the system. Share the results if that makes any difference in wireless connectivity performance. Also, please share the Operating System installed.
Dell Inspiron 7720 SE come configured with one of the following wireless cards, please share which one is installed on your system:
- Dell 1703 WiFi + Bluetooth 4.0 Half Mini-Card
- Dell 1704 WiFi + Bluetooth 4.0 Half Mini-Card
- Dell 1901 WiFi + Bluetooth 4.0 Half Mini-Card
- Intel 2230 WiFi + Bluetooth 4.0 Half Mini-Card
- Intel 6150 WiFi / WiMAX Half Mini-Card
Please reply with the information, I'll be happy to assist further.