I hear it very infrequently, it comes maybe every couple of months, seemingly at random, and it will be a fairly loud eeeeeeeee ringing sound. Then it just fades away after a few seconds and I continue on, wondering what our alien overlords have uploaded into my skull this time.

Apparently a very slight case of tinnitus is just very common. Most people just don't get it diagnosed because it's not necessarily so bad that it is distracting.

I have sensory processing disorder and can absolutely hear electronics, so not necessarily