"UnexpectedDBException" and "Server communication failure" after upgrade to 9.0

Hello,

Just upgraded teamcity version from 8.0.5 to 9.0 and sometimes builds fails with the following exception:

[17:04:10][Step 1/2] Unexpected exception occurred during message processing
[17:04:10][Step 1/2] jetbrains.buildServer.serverSide.db.UnexpectedDBException: Unexpected exception SQLDataException/HsqlException: SQL error when doing: DML query
SQL query: update stats set test_count=?, status_text=? where build_id=?
SQL exception: data exception: string data, right truncation
     at org.hsqldb.jdbc.JDBCUtil.sqlException(JDBCUtil.java:322)
     at org.hsqldb.jdbc.JDBCUtil.sqlException(JDBCUtil.java:247)
     at org.hsqldb.jdbc.JDBCPreparedStatement.fetchResult(JDBCPreparedStatement.java:4655)
     at org.hsqldb.jdbc.JDBCPreparedStatement.executeUpdate(JDBCPreparedStatement.java:310)
     at org.apache.commons.dbcp.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:105)
     at org.apache.commons.dbcp.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:105)
     at org.apache.commons.dbcp.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:105)
     at jetbrains.buildServer.serverSide.db.DBFunctions$9.run(DBFunctions.java:921)
     at jetbrains.buildServer.serverSide.db.DBFunctions$9.run(DBFunctions.java:918)
     at jetbrains.buildServer.serverSide.db.DBInternalUtils.rawOperation(DBInternalUtils.java:72)
     at jetbrains.buildServer.serverSide.db.DBFunctions.executeDmlInternal(DBFunctions.java:917)
     at jetbrains.buildServer.serverSide.db.DBFunctions.executeDml(DBFunctions.java:875)
     at jetbrains.buildServer.serverSide.impl.StatusInfo$3.run(StatusInfo.java:2)
     at jetbrains.buildServer.serverSide.db.DBFacade$3.run(DBFacade.java:219)
     at jetbrains.buildServer.serverSide.db.DBFacade$3.run(DBFacade.java:217)
     at jetbrains.buildServer.serverSide.db.DBFacade.withDB(DBFacade.java:234)
     at jetbrains.buildServer.serverSide.db.DBFacade.withDB(DBFacade.java:217)
     at jetbrains.buildServer.serverSide.impl.StatusInfo.saveToDatabase(StatusInfo.java:34)
     at jetbrains.buildServer.serverSide.impl.RunningBuildImpl.setBuildStatusDescription(RunningBuildImpl.java:597)
     at jetbrains.buildServer.messages.serviceMessages.BuildStatusTranslator.translate(BuildStatusTranslator.java:13)
     at jetbrains.buildServer.messages.BuildServiceMessagesTranslator$MessagesProcessor.processServiceMessage(BuildServiceMessagesTranslator.java:12)
     at jetbrains.buildServer.messages.serviceMessages.ServiceMessagesProcessor$1.serviceMessage(ServiceMessagesProcessor.java:65)
     at jetbrains.buildServer.messages.serviceMessages.ServiceMessage.parse(ServiceMessage.java:137)
     at jetbrains.buildServer.messages.serviceMessages.ServiceMessagesProcessor.processTextMessage(ServiceMessagesProcessor.java:57)
     at jetbrains.buildServer.messages.BuildServiceMessagesTranslator.translateMessages(BuildServiceMessagesTranslator.java:5)
     at jetbrains.buildServer.messages.BuildMessagesProcessor.translateMessages(BuildMessagesProcessor.java:1)
     at jetbrains.buildServer.serverSide.impl.RunningBuildImpl.processMessage(RunningBuildImpl.java:486)
     at jetbrains.buildServer.serverSide.impl.RunningBuildImpl.addBuildMessages(RunningBuildImpl.java:7)
     at jetbrains.buildServer.serverSide.impl.RunningBuildImpl.access$100(RunningBuildImpl.java:229)
     at jetbrains.buildServer.serverSide.impl.RunningBuildImpl$2.doInTransactionWithoutResult(RunningBuildImpl.java:2)
     at org.springframework.transaction.support.TransactionCallbackWithoutResult.doInTransaction(TransactionCallbackWithoutResult.java:34)
     at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:133)
     at jetbrains.buildServer.serverSide.impl.RunningBuildImpl.addAgentBuildMessages(RunningBuildImpl.java:180)
     at jetbrains.buildServer.serverSide.impl.BuildAgentMessagesQueue.doProcessMessages(BuildAgentMessagesQueue.java:27)
     at jetbrains.buildServer.serverSide.impl.BuildAgentMessagesQueue.access$700(BuildAgentMessagesQueue.java:13)
     at jetbrains.buildServer.serverSide.impl.BuildAgentMessagesQueue$BuildMessagesQueue$1.run(BuildAgentMessagesQueue.java:1)
     at jetbrains.buildServer.util.NamedThreadFactory.executeWithNewThreadName(NamedThreadFactory.java:89)
     at jetbrains.buildServer.serverSide.impl.BuildAgentMessagesQueue$BuildMessagesQueue.processMessages(BuildAgentMessagesQueue.java:25)
     at jetbrains.buildServer.serverSide.impl.BuildAgentMessagesQueue$2.run(BuildAgentMessagesQueue.java:8)
     at java.lang.Thread.run(Thread.java:745)
Caused by: java.sql.SQLDataException: data exception: string data, right truncation
     ... 40 more
Caused by: org.hsqldb.HsqlException: data exception: string data, right truncation
     at org.hsqldb.error.Error.error(Error.java:136)
     at org.hsqldb.error.Error.error(Error.java:106)
     at org.hsqldb.types.CharacterType.castOrConvertToType(CharacterType.java:485)
     at org.hsqldb.types.CharacterType.convertToType(CharacterType.java:598)
     at org.hsqldb.StatementDML.getUpdatedData(StatementDML.java:661)
     at org.hsqldb.StatementDML.executeUpdateStatement(StatementDML.java:515)
     at org.hsqldb.StatementDML.getResult(StatementDML.java:197)
     at org.hsqldb.StatementDMQL.execute(StatementDMQL.java:195)
     at org.hsqldb.Session.executeCompiledStatement(Session.java:1378)
     at org.hsqldb.Session.execute(Session.java:991)
     at org.hsqldb.jdbc.JDBCPreparedStatement.fetchResult(JDBCPreparedStatement.java:4647)
     ... 37 more

Also, when build is running and I open build log, all messages are loaded correctly, but when new messages supposed to show up, I get the following message:

Server communication failure
Server is unavailable since 12/24/2014, 10:02:39 AM
Server stopped or communication with the server is not possible due to network failure.

After refreshing build log page, new messages shows up, but I get the same message, when newer messages wants to load.

Any ideas what could be wrong?

EDIT: Ok, those issues appears just sometimes, but not everytime. Strange..