moodle throws deadlock dml error when editing due dates for assignments

When editing the due dates for an assignment in the editdate module moodle throws a dead lock error with debug as per below: This only seems to happen with the delete statement so i am guessing the module does an insert to update the change of dates.

[05-Apr-2018 09:33:22 America/Chicago] Default exception handler: Error writing to database Debug: Deadlock found when trying to get lock; try restarting transaction
DELETE FROM mdl_event WHERE modulename = ? AND instance = ? AND eventtype = ?
[array (
  0 => 'assign',
  1 => '375017',
  2 => 'gradingdue',
)]
Error code: dmlwriteexception

• line 489 of /lib/dml/moodle_database.php: dml_write_exception thrown
• line 1616 of /lib/dml/mysqli_native_moodle_database.php: call to moodle_database->query_end()
• line 1916 of /lib/dml/moodle_database.php: call to mysqli_native_moodle_database->delete_records_select()
• line 1233 of /mod/assign/locallib.php: call to moodle_database->delete_records()
• line 73 of /report/editdates/mod/assigndates.php: call to assign->update_calendar()
• line 193 of /report/editdates/index.php: call to report_editdates_mod_assign_date_extractor->save_dates()[05-Apr-2018 09:33:22 America/Chicago] Default exception handler: Error writing to database Debug: Deadlock found when trying to get lock; try restarting transaction
  DELETE FROM mdl_event WHERE modulename = ? AND instance = ? AND eventtype = ?
  [array (
    0 => 'assign',
    1 => '375017',
    2 => 'gradingdue',
  )]
  Error code: dmlwriteexception
• line 489 of /lib/dml/moodle_database.php: dml_write_exception thrown
• line 1616 of /lib/dml/mysqli_native_moodle_database.php: call to moodle_database->query_end()
• line 1916 of /lib/dml/moodle_database.php: call to mysqli_native_moodle_database->delete_records_select()
• line 1233 of /mod/assign/locallib.php: call to moodle_database->delete_records()
• line 73 of /report/editdates/mod/assigndates.php: call to assign->update_calendar()
• line 193 of /report/editdates/index.php: call to report_editdates_mod_assign_date_extractor->save_dates()