My nexus 7 2013 stopped connecting to wifi a week ago. Then realized bluetooth doesn't work. Wifi won't show any networks; it just fails to turn on and shows no mac address. I thought this must be a weird software issue that some config got mucked up. This happened with running stock 5.1.1 but then tried cm 12.1 to see if it will fix it. Before trying cm I did a factory reset (was stuck at the wifi signin screen) and I cleared the cache and data and cleared dalvik cache. So then I tried CM but unfortunately, this also happens. This has me pretty much convinced that it is a hardware issue and something is wrong with the wifi/bluetooth chip.
Just wanted to see what others thought. After the above, I can't see how this isn't a hardware issue. I was looking and motherboards aren't too expensive and it doesn't look too hard so I might try that.
Oh a weird thing, in this state it is causing an excessive battery drain even when off. It's been off for 8 hours at 100% charge and now is at 74%. So I'm keeping an eye on it to keep it charged until I get a motherboard replacement.
