ERROR - A system error has occured in lock management

Dear All ,
I have a major issue in my workflow in production client  .  In SWEL  there are some workflows which
got started & then  error occured as per the message " A system error has occured in lock management " and no workitem gets created .
This issue happened just 1 day back and still continues somtimes .
If any one have any idea on the issue , what is the root cause of the issue , please suggest how to solve the same .
Regards
Prabhu

No WF-BATCH is not locked . This issue does not happen every time , it happens some times .other wise workflow runs fine .
I will tell you when i checked abot the error message by clicking F1 help i got the below message details-
An error occurred in lock management when attempting to set a lock on table SWWWIHEAD.
The data cannot be processed at the moment. The data is displayed.
So i think there is some issue happens in updating the entry in the table which happens some times , and gets rectified automatically . But the workflow which gets affected by this error does not start .
so any idea on the same .
Regards
Prabhu

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