I use Viber a lot, I mean a lot. I don't have any problem with my old ph but now having an issue with Galaxy S4. While in a middle of conversion when a local call came in, which normally re-connect but not anymore with Galaxy S4. Not only that my viber gone freeze. There's nothing I can do except I have to reboot. This is annoying, some time I have to do 3,4,5 times. Is there anyway can you help? that be great and I thank you in advance!