After I force stop it, and restart whatsapp, every thing works as expected. in five minutes again, it stops working. If I do force stop and restart it, it again starts working.
I do not change anything or even touch the phone, no other apps are running, even I did factory reset and installed only whats-app, nothing else, but the behaviour is the same, I changed sim card, or wifi network, but nothing seems to change, even as last resort system update to 8.1 didn't change the behaviour, it works and suddenly stops and start working after force stop.
only that behaviour is consistent.
my question is, how to diagnose this ? or solve this ? all ideas are welcome including changing the damn phone. :)