I have seen similar issue with my last Studio and posted the problem in this thread.
My current Studio has not exhibited this problem so far (w/ Fall Creators Update), but it has other problems (extreme slow HDD, 5-10min boot time, even after three factory reset).
My experience on this (after getting my fifth Studio and fourth replacement) is that this device is very unreliable, often exhibiting different kind of issues from unit to unit. So I wouldn't be surprised if the Bluetooth impacted Studio is a lemon (as was my previous one).
My hope on Microsoft to resolve any problem is very low. This forum is unhelpful in general, and they generally don't get back at me even if they do respond.