Random JBoss failures - "stopping Coyote"

We have an application running on JBOSS.  It looses connections to the database at seemingly random intervals, more than once per day, sometimes maybe 7 in a day.  The log file always shows a message saying stopping Coyote

JBOSS is running on a virtual Windows 2008 R2 server

We cannot see any correlation between user activity and the errors

The same problem exists on a Production Service and on a similar Pre-Production service running in a different data center (but provided by the same outsource partner).

Has anyone had a similar experience or can point to some solution (or diagnostics) which we could deploy
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Coyote is webserver component of tomcat.
There is a serious vulnerability in that. If not covered  with reverse proxy it is very easy to crash from the net.
isenseAuthor Commented:
Eventually we traced the problem to SQLNET time out on ORACLE server.  With the default setting (zero) it caused frequent connection failures.  We changed the setting to 10 mins and seems OK now

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isenseAuthor Commented:
Resolved by own efforts
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