I purchased JBL Pulse in 2014 January and became proud of it very soon. The JBL Pulse Bluetooth Speakers worked very fine with my the then Windows 8 OS and LG Nexus 5. 2014 went quite good for my music appetite and I faced no challenges. But....my Windows 8 OS was downgraded to Windows 7 due to file corruption. As soon as I rolled back to Windows 7, the laptop began losing connectivity with my JBL Pulse Bluetooth Speakers. I tried very hard to make the Bluetooth connection a success between laptop and JBL but ultimately lost.
I also noticed that the AUX connection with laptop and JBL doesn't work as smooth as the Bluetooth connectivity. The sound quality coming out of from the AUX connectivity was awful, dull and unacceptable. I too realized that the AUX cable which I used wasn't of the best quality. May this was the reason the sound quality was just awful.
2015 no connectivity problem with my LG Nexus 5 until 2016 Summer.