Mountain Lion random and/or consist ejects external disks/USB Flash drive for no reasons

Hi,

Please, if anyone have solve the my problem?

- Mountain Lion random and/or consist ejects external disks/USB Flash drive for no reasons.

My Mountain Lion OSX is freshly install then time machine migration for prior infomration. And then installed the latest OS update from Apple.

I have for already turned off the sleep/wake harddrive in power saver. But the problem still exist.

Thanks for everyone.