Zgemma H2S audio issues

Hi guys

I am banging my head atm, i had very low sound on all channels and for some reason the down audio mix was enabled, it wasn't like that last night very weird, so i turned it off and everything returned to normal..... Now I've got a very low sound on bbc 1 only downmix is not enabled but I noticed there's no ac3 audio to select like on the other FTA channels and now my IPTV is the same any ideas what's gone wrong over night? And how to rectify the issue
 
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