All Application threads stopped for 3~5 minutes

Hi.
Our Java application experiences sudden 3~5 minutes application threads stops.
Our Application is run by 1 process and 300~400 threads.
All threads are stopped suddenly and are run after 3~5 minutes or more.
I can't analyze any patten but I experience this problem once or twice a day.
I guess it is caused by application bug, java bug or Solaris bug and so on.
I have difficulty to solve this problem and I can't find what causes it.
Please give advice on this problem.
(*) Our system :
SunOS Solaris 5.10 Generic_138888-03 sun4u sparc SUNW,Sun-Fire-V890 (32G Mem)
(*) Java :
java version "1.5.0_12"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_12-b04)
Java HotSpot(TM) Server VM (build 1.5.0_12-b04, mixed mode)
(*) Java Options
-mx2048m -Dcom.sun.management.jmxremote.port=16000
-Dcom.sun.management.jmxremote.authenticate=false
-Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.snmp.interface=`hostname`
-Dcom.sun.management.snmp.acl=false -Dcom.sun.management.snmp.port=16500 -Xcheck:jni
-XX:+PrintGCDetails -XX:+HeapDumpOnOutOfMemoryError -XX:+PrintGCApplicationStoppedTime

Show your GC logs.

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