Exchange Sync Error

Exchange Sync worked for a year, but suddenly since monday it does not for my user. Exchange configuration proctol Shows the following error every 5 minutes:

ERROR [http-apr-10009-exec-8]: 29-Nov-2017 15:17:08.162 [björn] error: com.sage.scrm.syncengine.exchange.db.error.SageDatabaseAccessException: Only one record expected, more found localId = AAMkAGY2OGQ5NzI5LTNjMTgtNDNhOS04NDA1LTAzZTY4ODY5N2MyNABGAAAAAACnJKpYHIxLSJGuj9kXWZSKBwDkV8eoy4VBS5+vD109zCBvAAAAAAENAADkV8eoy4VBS5+vD109zCBvAAKSJ2RtAAA=, action: CONNECTION_TO_MAILBOX

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