After reading some of the reviews I realized that I have experienced some of the same problems. I reported problems to iTunes and they gave me way to communicate with makers of Zen Master who also told me to use refresh button and this has been working well. I like the male voice and also their ideas. Im keeping the connection to the app designers in case need to communicate again.
Alisbetter about Zen Mixer - Anxiety, stress & depression guided meditation and relaxation sleep