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Hi Jona I'm getting this error too (e:-31) with Xiia on a newly purchased LG G4 (Tmobile) running on both home-wifi and 4g) -- only on a particular stream -- which still works just fine on my old Galaxy G2 (it may have an older Xiia - have not checked yet). I'm a dev (mostly web and protocol-level) so could assist with various tests or tcpdump etc, but you may find the source URL more useful - since it is not public I'd need email it to you offline - or if you provide public another stream'sURL others reported as having the error, I can test that...

Please email me here if you'd like my help..