Subtitles

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I have a new 75 inch model number 75UM6970PTB
When we set subtitles on...it stays on.
But when we watch SBS on Demand, and finished watching it...than when we return to normal chanels...than the subtitles disappear!
Than we have to reset to original settings.
We need help as my wife is hard of hearing.
JBHIFI customer service has not been able to supply a solution