I am sometimes told that I am too loud. My voice just seems to get louder when I speak longer, a bit like getting out of control without realizing it. Then I am told that, try to keep my voice down, but after a while it gets louder again.
On the other hand there are also occasions when I speak not loud enough and tend to mumble, so people tell me to speak louder and not to mumble.
Over the time I think I found a pattern regarding those two modes: When I am rather excited or confident then my voice seems to get out of control (maybe I feel too confident to worry about trying to avoid it or my interest in the topic is far more present in my mind, so I just cannot concentrate on my voice). When I am not so confident or not interested I tend to be rather quiet (not talking much) in general and if I talk I am not loud enough.
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English is not my native language. So it is possible that there are mistakes in my posts. Please correct me, I´m still learning.