Lost Sound with Doodle Jump Only

iphone 4. apps, games , functions have sound , work fine. doodle jump though no longer has sound of 2 days ago. settings within doodle jump app have sound marked "on." there no sound. ideas?

 

wirelessly posted (mozilla/5.0 (iphone; cpu iphone os 5_0_1 mac os x) applewebkit/534.46 (khtml, gecko) version/5.1 mobile/9a405 safari/7534.48.3)

switch on side not switched mute?

tried force quit of app/ reboot of ip4??

 

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