Can not change channel from IPad

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    I have been using sling box on my I pad for a year now with no problems,  yesterday I was watching different show and flipping thru channels no problem, then I closed the I pad for a bit and now when I log into sling box it is stuck on channel 2, I can pick a new channel like 66 and it says I am on 66 but the tv show is still that which is on channel 2