Join Date:Joined: May 2012
Sorry to bump this thread but im having the same problem with my htc one x.
From what i see there isnt a solution yet but i found something that made things better, i still need sometimes to reconnect whatsapp in order for it to work but a lot less than before.
Go to your Talk app (google), first make sure your online, then go to settings and uncheck the box that says "List me as away when screen off" or something like that (my phone is not native english).
Could be by coincidence but whatsapp started working better after i did this little chance, please tell me if you notice that whatsapp is working better after this, or if you have another solution.