Sun cluster :Db_evaluate problem

I have Sun cluster 2.2 in the folowing environment.
Nodes: 2 Sun fire 420 r
Storedge :2 D1000
OE : Solaris 2.6
Cluster Sun Cluster 2.2 Parallel clustering.
Disk Suite : Solstice disk Suite 4.2
Physical node name :saacclr1 and saacclr2
Logical host name :haexp and haimp
Oracle instance name:attsuc1 and attsuc2
DBMS - oracle 8i
Suddenly 1 node "haimp" from saacclr2 failed and all the the services are taken over by second node saacclr1.now saacclr1 has "haexp and haimp".
Is there a known bug or a set of
conditions that we now have that could cause this ?
error messages
Nov 23 17:51:35 saacclr2 ID[SUNWcluster.ha.haoracle_fmon.4520]: haexp:attsuc1: cannot find the SQL*Net service for attsuc1
Nov 23 17:51:49 saacclr2 ID[SUNWcluster.ha.haoracle_fmon.2050]: haimp:attsuc2: db_evaluate: --- Oracle background process died ---
Nov 23 17:51:49 saacclr2 ID[SUNWcluster.ha.haoracle_fmon.2090]: haimp:attsuc2: db_evaluate: initiating DBMS service takeover
Nov 23 17:52:20 saacclr2 ID[SUNWcluster.loghost.1010]: Giving up logical host haimp
Nov 23 17:52:20 saacclr2 ID[SUNWcluster.loghost.1050]: fm_stop method of data service oracle completed successfully.
Nov 23 17:52:22 saacclr2 ID[SUNWcluster.ha.oracle.fault_mon.2001]: haimp:attsuc2: starting shutdown immediate for oracle instance attsuc2
Nov 23 17:52:27 saacclr2 ID[SUNWcluster.ha.oracle.fault_mon.2005]: haimp:attsuc2: Shutdown immediate for oracle instance attsuc2 completed
Nov 23 17:52:28 saacclr2 ID[SUNWcluster.loghost.1050]: stop_net method of data service oracle completed successfully.



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