Edited Metadata not saved

OJS 3.1.1.4

Since yesterday, it’s happening that after editing metadata of article when I press save button, it remains in the loop/stuck there. So, the changes I want to make in Metadata (Title, Abstract, References, Keywords…) are not saved.
I have visited a php error log as well but could not find any fatal error. The worse thing is because of this issue I was getting blocked repeatedly from the server as well to access my website.

below is Error log:

[27-Sep-2018 00:21:54 America/Chicago] PHP Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; Smarty has a deprecated constructor in /home/seisense/journal.seisense.com/lib/pkp/lib/vendor/smarty/smarty/libs/Smarty.class.php on line 64
[27-Sep-2018 00:21:54 America/Chicago] PHP Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; ADODB_Cache_File has a deprecated constructor in /home/seisense/journal.seisense.com/lib/pkp/lib/adodb/adodb.inc.php on line 263
[27-Sep-2018 00:21:54 America/Chicago] PHP Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; ADOConnection has a deprecated constructor in /home/seisense/journal.seisense.com/lib/pkp/lib/adodb/adodb.inc.php on line 359
[27-Sep-2018 00:21:54 America/Chicago] PHP Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; ADORecordSet has a deprecated constructor in /home/seisense/journal.seisense.com/lib/pkp/lib/adodb/adodb.inc.php on line 2921
[27-Sep-2018 00:21:54 America/Chicago] PHP Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; ADORecordSet_array has a deprecated constructor in /home/seisense/journal.seisense.com/lib/pkp/lib/adodb/adodb.inc.php on line 3939
[27-Sep-2018 00:21:54 America/Chicago] PHP Deprecated: The each() function is deprecated. This message will be suppressed on further calls in /home/seisense/journal.seisense.com/lib/pkp/lib/adodb/adodb.inc.php on line 1003
[27-Sep-2018 00:21:54 America/Chicago] PHP Warning: Declaration of PKPUsageEventPlugin::getEnabled() should be compatible with LazyLoadPlugin::getEnabled($contextId = NULL) in /home/seisense/journal.seisense.com/lib/pkp/plugins/generic/usageEvent/PKPUsageEventPlugin.inc.php on line 24
[27-Sep-2018 00:21:54 America/Chicago] PHP Warning: Declaration of CustomHeaderPlugin::register($category, $path) should be compatible with LazyLoadPlugin::register($category, $path, $mainContextId = NULL) in /home/seisense/journal.seisense.com/plugins/generic/customHeader/CustomHeaderPlugin.inc.php on line 141
[27-Sep-2018 00:21:54 America/Chicago] PHP Warning: Declaration of AddThisPlugin::register($category, $path) should be compatible with LazyLoadPlugin::register($category, $path, $mainContextId = NULL) in /home/seisense/journal.seisense.com/plugins/generic/addThis/AddThisPlugin.inc.php on line 175
[27-Sep-2018 00:21:54 America/Chicago] PHP Warning: Declaration of CustomBlockPlugin::getBlockContext() should be compatible with BlockPlugin::getBlockContext($contextId = NULL) in /home/seisense/journal.seisense.com/plugins/generic/customBlockManager/CustomBlockPlugin.inc.php on line 19
[27-Sep-2018 00:21:54 America/Chicago] PHP Warning: Declaration of CustomBlockPlugin::getEnabled() should be compatible with BlockPlugin::getEnabled($contextId = NULL) in /home/seisense/journal.seisense.com/plugins/generic/customBlockManager/CustomBlockPlugin.inc.php on line 19
[27-Sep-2018 00:21:54 America/Chicago] PHP Notice: Only variables should be passed by reference in /home/seisense/journal.seisense.com/plugins/generic/customBlockManager/CustomBlockManagerPlugin.inc.php on line 65
[27-Sep-2018 00:21:54 America/Chicago] PHP Notice: Only variables should be passed by reference in /home/seisense/journal.seisense.com/plugins/generic/customBlockManager/CustomBlockManagerPlugin.inc.php on line 65
[27-Sep-2018 00:21:54 America/Chicago] PHP Notice: Only variables should be passed by reference in /home/seisense/journal.seisense.com/plugins/generic/customBlockManager/CustomBlockManagerPlugin.inc.php on line 65
[27-Sep-2018 00:21:54 America/Chicago] PHP Notice: Only variables should be passed by reference in /home/seisense/journal.seisense.com/plugins/generic/customBlockManager/CustomBlockManagerPlugin.inc.php on line 65
[27-Sep-2018 00:21:54 America/Chicago] PHP Warning: Declaration of OpenAIREDAO::setOAI(&$oai) should be compatible with PKPOAIDAO::setOAI($oai) in /home/seisense/journal.seisense.com/plugins/generic/openAIRE/OpenAIREDAO.inc.php on line 19
[27-Sep-2018 00:21:54 America/Chicago] PHP Warning: Declaration of DRIVERDAO::setOAI(&$oai) should be compatible with PKPOAIDAO::setOAI($oai) in /home/seisense/journal.seisense.com/plugins/generic/driver/DRIVERDAO.inc.php on line 65
[27-Sep-2018 00:21:54 America/Chicago] PHP Notice: Only variables should be assigned by reference in /home/seisense/journal.seisense.com/pages/index/IndexHandler.inc.php on line 68
[27-Sep-2018 00:21:54 America/Chicago] PHP Warning: Declaration of SubmissionFileDAO::fromRow($row) should be compatible with PKPSubmissionFileDAO::fromRow($row, $fileImplementation) in /home/seisense/journal.seisense.com/classes/article/SubmissionFileDAO.inc.php on line 23
[27-Sep-2018 00:21:54 America/Chicago] PHP Warning: count(): Parameter must be an array or an object that implements Countable in /home/seisense/journal.seisense.com/cache/t_compile/cc87c37be02cfb67c21f370fae28834e2716951e^%%40^408^4081C66E%%footer.tpl.php on line 37

any suggesttions please on how to resolve this problem.
Thanks