I haven't had problems with Bluetooth in a while - love my TWS earbuds, RF mouse, BT mouse and BT/RF keyboard. Those devices last for months/years on two AA batteries (other than the headphones of course). I will concede that the audio delay degrades the call experience a bit.

Wifi on the other hand... I have no idea if its interference or the modem. It worked fine for months, then all of sudden my connection went to 2Mbps. And my Chromecast can no longer connect to it, etc..