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did you get this fixed I have this problem with 3 drones all brand new FC
I second that you need more vibration dampening. Had exactly same on my quad and affixed apm on very soft foam with double sided tape. Now perfect.
Below are some helpful web pages on working with logs.
Logs
There are a few wiki pages where we talk about how to use the dataflash and tlogs here (http://code.google.com/p/arducopter/wiki/AC2_Datalogging), here (http://code.google.com/p/arducopter/wiki/AC2_Record) and here (http://code.google.com/p/arducopter/wiki/AC2_Logs). The last two pages have videos on them where I go through some of the details so that might be useful...
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Alt Hold does not make use of GPS, but it does rely heavily on accelerometers in 2.9.1b and later.
Your problem is almost certainly being caused by vibration of the flight controller board.
Look on the Wiki here regarding vibration damping. http://copter.ardupilot.com/wiki/vibration-damping/
or the Old wiki here.
https://code.google.com/p/arducopter/wiki/VibrationControl
Four Kyosho Zeal Pads under the corners of the flight controller will probably provide sufficient damping for your copter to perform properly in Alt Hold.