Caynax tracker interrupts other audio book app

I listen to audio books while walking. At the same time I use the Caynax tracker. Recently, like in the last week, the tracker stops the audio book.

It used to be that the tracker would break in and announce the 1 mile, 2 mile, etc and beep when a 10 minute (or whatever) happened. The audio app used to continue but now I have to stop and restart it.

Still true after a month. Any sound produced by the tracker interrupts audio book. So, it’s turned off. Please fix.