Logic Will Randomly Lose Phantom Power

I have an Apogee One running into Logic Studio 9. On the Apogee One, I am running and XLR cable to an Apex Microphone, and a 1/4" cable to a guitar (At Different times). When recording either the Guitar, but most commonly with the Phantom Power on the 48V Input, the Microphone will drop out temporarily and not pick up any sound, then slowly it will fade back in. This happens every couple of minutes during a recording. We have already replaced the Apogee One, but the issue still seems to occur.

Any Suggestions?