Sudden, very temporary deafness in either ear

26, male, 6ft, 200 lbs. High systolic bloodpressure, 140/78 at rest. Happy to provide more info if it'll help.

I occasionally experience instantaneous deafness in either ear, not both at the same time. Tinnitus arises in the ear a few seconds later, and regular hearing returns quietly and then all the way back to normal within a few seconds. The entire event last 20-30 seconds, and happens sometimes once a month and sometimes twice a week.

It's usually so transient I forget to bring it up with my GP. I'm posting here because it just happened again. There are no other perceivable symptoms, no loss of balance, vision, headache, anything. I do not listen to loud music, I'm not often exposed to loud noises.

Is this harmless? Normal? Or am I headed for trouble?