drummer suddenly switches patches to bass or piano
I am having a problem with Drummer. It suddenly switches to a bass or piano sound. I have no clue as to why this happens. Sometimes it immediately happens and sometimes it takes a few minutes, but inevitably it will at some point switch whenever I do some tweaking with the controls.
It is as if it gets overloaded and then it abruptly turns into a bass sound. If anyone out there has an idea, I sure would appreciate your help.
I am running on a mac pro 8 cores with 26 gb of ram. Buffer settings make no difference.
Logic Pro X, OS X Mavericks (10.9)