Why don't I hear the Full adhan?
Apple only allows 30 seconds for an alert sound, if launched from background.
When the app is active and adhan is set to Mecca, the full adhan will play.

Hijri date gives wrong display in Malaysia
This appears to be an IOS Bug
Please go to Settings>International>RegionFormat and change region from Malaysia to Singapore.

App freezes when turning of all prayer alerts
This bug is solved in version 1.2.3
Delete and reinstall or update app.