Unable to acquire a Read connection. Safe to retry.

We are facing below issue intermittently

ERROR:An error occurred while evaluating expression: oldValue:extract(toxml(pv!cdtOld),"<"&ac!compareFieldName&">","</"&ac!compareFieldName&">") (Unable to acquire a Read connection. Safe to retry. ) (Data Outputs)

We are not able to get any additional information in logs. Can anyone please tell why this is happening?
Thanks in advance.

OriginalPostID-236570

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