ANDROID Help: key click sound volume change does not survive igo restart

Hi, I have iGO Primo v9.6.29.636868 with Gurjon skin on android 6.0 phone. When I change key click sound volume from "program settings -> sound & warnings -> volume", it only stays for the current session. If I exit and restart igo, the volume changes back to maximum by itself.

Please let me know if you have any info regarding this. Thanks