maybe you could ask the creators-if they have any idea?
It used to last for much longer than an hour for me, here is a preliminary understanding of what I’ve discovered about it.
Any sound without an external auditory or overly mechanical source is considered tinnitus technically,
and its a neurological effect. When your brain is fatigued it could simply fail to filter out the sounds the your own internal mechanisms or even the sound of your own neurology. Perceiving the sound as foreign, or a threat could exacerbate it since it becomes a target for your neurology to focus on out of concern. It similar to an auto-immune issue in this way. This becomes a negative feedback loop. As funny as it sounds the solution is mental in learning to put as little interest in it as possible, and having no emotional reaction to it. how bothersome/ difficult is it for you?
I can PM some resources that may support if it’s a challenge you want to further address.