Simply noise stops working or volume drops

I too have noticed the volume level drops significantly every night after about 10 minutes.
This happened before but seems like the problem was fixed and then it started happening again.
I had started turning the app off and then back on but the volume level still would drop after about 10 minutes. PLEASE FIX THIS because I really have enjoyed this virtual white noise app over the actual white noise device. I use this app on trips and its been wonderful, but this problem needs to be fixed.

WhatsUpWithThatApp about SimplyNoise - Free White Noise