Viber via wifi - only works sometimes

I use Viber all over the place, so both using wifi and 3G, as do a number of my contacts.No problem.
However I have one friend who uses it at home (on wifi) no problem, 3G no problem, but on one particular wifi network it will not deliver messages. On that same network, I can use it no problem.
Anyone any ideas? I'm thinking it can't be a firewall/routing issue if I have no problem. But struggle to see how it could be a phone/app issue if it works on some networks and not others?

geek_smac, Mar 21, 12:44 pm

Check the wifi sleep policy in viber settings.

geek_rz_zone, Mar 21, 12:54 pm

Yep that's 'always on'.

geek_smac, May 3, 9:59 am

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