what's app messages taking hours to reach recipient.

how do I fix this ? is it my phone or is it my carrier ? or is it an issue that what's app need to fix ?

I have emailed them but no reply....why do large app developers hardly ever reply to emails ?

via Smartphones: PinStack.com http://forums.pinstack.com/f211/whats_app_messages_taking_hours_reach_recipient-140919/