Kaspersky Who Calls may have the following issues (and solutions) on ASUS devices:
On the ASUS ZenFone 2, Kaspersky Who Calls may not start after the device is restarted or the app is unloaded from memory. To fix this, allow autostart for Kaspersky Who Calls in the Autostart Manager settings.
On Asus ZenFone 4 Max (ZC554KL), Kaspersky Who Calls may not block incoming spam calls.