They certainly have in the past:

"The term 'bug' was first used by Grace Hopper on September 9th, 1945 when 
a real bug, a moth, short-circuited an early computer on relay number 70 
Panel F, 
of the MARK II Aiken Relay Calculator, in the Harvard University. "

        
http://wiki.answers.com/Q/What_is_the_origin_of_the_term_'computer_bug'


Karen Tellefsen - Electrical Testing
Alpha / 109 Corporate Blvd./ S. Plainfield, NJ 07080
[log in to unmask]

From:   Victor Hernandez <[log in to unmask]>
To:     <[log in to unmask]>, 
Date:   09/19/2013 09:05 AM
Subject:        [TN] Bug / Insects skeletal
Sent by:        TechNet <[log in to unmask]>



Fellow TechNetters:

  Can the remains of Insects/Bugs skeletal on the surface of a motherboard 
cause a functional failure before they died?

Victor,




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