This message was posted on behalf of Intel Corporation
Based on your description, there may be an issue with the coexistence of Bluetooth and WiFi in your system, or this may be caused by the driver. Your OS uses Linux Kernel 4.5.4, so it should support the adapter, even more if you have updated the firmware already.
We would like to let you know that the Linux drivers are part of the upstream Linux kernel and are available through the distributions, or The Linux* Kernel Archives.
Driver development is done in the open source Linux community and this type of issues are better handled through the support for your Linux distribution, or the mailing lists found at the Linux Community page - iwlwifi. I would like to mention that this page actually mentions WiFi / Bluetooth coexistence issues in Linux:
"Having and WiFi running at the same time is a challenge. These scenarios have been tested thoroughly on 7260 and up, less so on earlier devices. This is why some people may face issues with devices that are handled by iwldvm. For users of these devices who have problems when WiFi and Bluetooth are running concurrently, we suggest to disable BT Coex by loading iwlwifi with bt_coex_active=0 as a module parameter."
We advise you to check the links provided, and engage the Linux resources found there for additional details.
You may also contact the Computer Manufacturer Support for assistance regarding the Dell XPS 13 Developer Edition.