Very unreliable performance for quite some time now. Multiple issues with the calling function of whatsapp. 1. On audio calls on speakers, the moment my screen turns off, the mic also seems to be disconnected as the person on the other side of the call cannot hear what I am saying. 2. 8 out of 10 times, I do not get call notifications. It is only when I unlock and open my phone later, I see flashes of notifications of a missed audio/video call that came in some time ago.