I use my Bose QC35 Bluetooth headphones with my MacBook to watch movies. The system has a comfort meter: when my head is in exactly the most comfortable spot on the couch, the Bluetooth signal drops out completely.

It also drops out when I touch my head or my face.

I have tried reorienting the laptop to no avail. No matter where the laptop is (or, in fact, any components of the system, including the couch between 1m and 2.5m distance from the laptop) it always finds the same comfort spot to drop out completely.

If I move my neck about 15 degrees to an uncomfortable angle, the signal is perfect.

An anecdote, yes, but a relevant one.