My volume goes up and down sporadically (Radioboss).
According to the developer, the problem only occurs with versions of Radioboss Broadcaster that have not been legally purchased.
So the listed problem disappears after the legal purchase of the Radioboss software.
Buy Radioboss: https://www.djsoft.net/enu/buy.htm
If you still have problems with Radioboss, please contact the developers.