New bug shuts down Bluetooth on the Google Pixel and Pixel XL26
On both Reddit and Google's Pixel community support site are comments from various Pixel owners complaining how their Bluetooth is toggling off without them touching the button. Google has yet to acknowledge this particular problem, which comes on the heels of an issue with the battery that Google has acknowledged. This problem causes certain Pixel and Pixel XL units to shut down when the battery shows that it has 30% of its charge remaining. A patch to fix this annoying battery bug is believed to be arriving soon.
The Bluetooth problem appears to have showed up following the dissemination of Google's February 2017 security patch, which sounds like more than a coincidence. First thing to do is to jump up and down in front of Google while waving your arms to make sure that they understand that there is a problem. Once you get them to admit that, getting them to send a fix should be a snap.
source: Reddit, Google via AndroidPolice