Error server side Apache2 and sync problems

Hi friends,
I have some problem with the sync between two computers Linux Ubuntu 14.04.

On Apache error log I can see many errors as this one:

[Wed Jul 05 17:49:23.511533 2017] [:error] [pid 30357] [client 79.60.53.47:59455] PHP Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[40001]: Serialization failure: 1213 Deadlock found when trying to get lock; try restarting transaction' in /var/www/owncloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php:91\nStack trace:\n#0 /var/www/owncloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php(91): PDOStatement->execute(NULL)\n#1 /var/www/owncloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(987): Doctrine\\DBAL\\Driver\\PDOStatement->execute()\n#2 /var/www/owncloud/lib/private/DB/Connection.php(209): Doctrine\\DBAL\\Connection->executeUpdate('UPDATEoc_file...', Array, Array)\n#3 /var/www/owncloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Query/QueryBuilder.php(208): OC\DB\Connection->executeUpdate('UPDATE *PREFIX...', Array, Array)\n#4 /var/www/owncloud/lib/private/DB/QueryBuilder/QueryBuilder.php(141): Doctrine\\DBAL\\Query\\QueryBuilder->execute()\n#5 /var/www/owncloud/lib/private/Lock/DBLockingProvider.php(277): OC\\DB\\QueryBuilder\\QueryBuilder->execute in /var/www/owncloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php on line 115

And

[Wed Jul 05 17:54:06.090953 2017] [:error] [pid 30357] [client 79.60.53.47] ModSecurity: Error reading request body: Partial results are valid but processing is incomplete [hostname "www.teatroscientifico.com"] [uri "/owncloud/remote.php/webdav/CHIAVETTA/AGGIORNATI/Documenti Jana/Teatro Scientifico/CARNET VERONA/2017/MARZO 2017 al Teatro Laboratorio.odt-chunking-4164290425-2-0"] [unique_id "WV0Lkn8AAQEAAHaVHgMAAAAJ"]

Could it depend on these errors?

many thanks

Hi

What version of owncloud are you running? More info about your setup would be great

Hi Dmitry and thanks for your help!

I had solved this issues some time ago.
The problem was generated following a provider (and Owncloud version) change.

For solve I've followed this post

Thanks!

Thanks for the feedback and for providing the solution