After disconnecting midway, hard disk IO is still very high

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Nextcloud version :
Operating system and version :openwrt
Apache or nginx version nginx :1.15.3
PHP version :7.2.9

The issue you are facing:

When I download a file (including online play), the hard disk will continue to be in the read data state. It seems that the complete reading of a file will stop, even if the connection has been disconnected. This is for fast switching files. In the case, especially when large files are used, the performance of the server will be seriously slowed down. Is there any way to solve it?

Is this the first time you’ve seen this error? :N

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

$CONFIG = array (
  'instanceid' => 'xxxxx',
  'passwordsalt' => 'xxxxx',
  'secret' => 'xxxxx',
  'trusted_domains' => 
  array (
    0 => 'xxxxx',
  'datadirectory' => 'xxxxx',
  'dbtype' => 'mysql',
  'version' => '',
  'overwrite.cli.url' =>'xxxxx',
  'dbname' => 'xxxxx',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => 'xxxxx',
  'dbpassword' => 'xxxxx',
  'installed' => true,
  'mail_smtpmode' => 'smtp',
  'mail_smtpauthtype' => 'LOGIN',
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'updater.secret' => 'xxxxx',
  'maintenance' => false,
  'theme' => '',
  'loglevel' => 2,

Same issue here, I have tried to disable file locking, does not work