Strange issue with iPad 6th gen speakers

Hello all,
I have encountered a strange issue with my 6th gen iPad. When I have it in portrait mode both the top and bottom speakers have sound coming out of them. However when I turn it to landscape, the speaker that is normally at the top of the device stops having sound come out of it. The only speaker that seems to work in landscape is the one near the home button. Does anyone have any suggestions I could try to fix this?

Greg Wocher