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Pitch Bend/Spontaneous transposition on Keystation 61es

My Keystation 61es is automatically transposing down the data on whichever channel it is affecting. At first everything seems ok, but after a few minutes this transposition occurs spontaneously, or it occurs immediately after the first time I touch the jog wheel (even if I only move it slightly). The transposition is always the same amount (roughly equivalent to turning the wheel all the way down) so that, in it's normal position, the audio is played much lower than intended and, when holding the jog wheel all the way down, there is no difference at all. I can't see that this has anything to do with the "advanced functions" as I have followed the instructions to reset them. I am using Logic Pro 9. Some insight into what could be going on would be very much appreciated. Thanks.
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