Why am I getting DISK REMOVAL Error

[Play4keeps]

I have the Sonnet Tempo SATA E4P and icydock MB561series 4 Bay Raid 0
when in the middle of working Fcp or Imovie I get a I get a DISK REMOVAL
ERROR which causes my raid to disappear from desk top.(Also kills work not saved.)
But once i restart all is fine agin It does not happen every time but a few to many
times it has also i moved the card to slot 3 same thing any help on this would be very helpful.

Drive bay= http://www.icydock.com/product/mb561s-4s.html

Sonnet Tempo= http://www.sonnettech.com/product/tempo_sata_e4p.html

 

[Play4keeps]

Anyone out thier

 

[Help!]

Maybe one of the pieces of hardware is faulty. I guess you probably aren't accidently tugging on the cables?