Just chiming in that I have been using the latest Bliss builds as they've been released, and haven't had any issues whatsoever with bluetooth connecting to any of my devices (e.g. headphones, car, tablet, laptop) for at least a month.
Also, no issues with excessive heat, 5 ghz wifi, or data. This ROM has been rock solid for me for some time now. A huge thanks goes out to the devs for putting so much effort into this project.
For what it's worth, I'm on AT&T (through Cricket), S-off, rooted, latest TWRP, latest firmware, 2-5 build.
Which firmware are you using? Sense or GPE ?