So I have recorded guitar, a simple track with no effects to it. I plug in a keyboard and select it to record a some chords on a second track while listening to the guitar. If I play really gently on the keys everything works fine, but it is like if the keyboard recording reaches a certain volume level the sound completely shuts off, and you have to either unplug the keyboard and plug it back in, or restart Logic to get it back. And still the problem remains, what could be the problem?