Yes actually, and it still bothers me years later. Mine was more of a low drone than a hum, like something electrical but with no source. It started maybe 30 seconds before I lost about 2 hours near a forest road outside Cluj. When I came back to myself I was sat on a verge with no memory of getting there and the sound was completely gone.
The detail that sticks with me is how the air felt kind of thick, pressure in my ears like being underwater. Not painful just... wrong.
Read a few accounts where people describe the same sequence - sound, pressure, then nothing. Wondering if the humming is some kind of signal or maybe a side effect of whatever propulsion or dimensional shift is happening nearby. Or maybe its the body registering a frequency we dont normally perceive.
Anyone else notice whether the pitch changed right before the blackout? Mine seemed to drop lower just before I lost time. Curious if thats consistent across different accounts.