Server answer "423 locked"

[Juusi]

Dear Support,

The client is recieving next message in his MasOS Nextcloud client app ->Activity.

! Server aswered “423 Locked” to "DELTETE https://server-name/remote.php/dav/folder/subfolder
/file.xxx

! Server aswered “423 Locked” to "PUT https://server-name/remote.php/dav/folder/subfolder
/file-2.xxx

How can the user solve this issue?

Thanks in advance for your assistance.

Nextcloud version _V15.05
Operating system and version _ Ubuntu 18 LTS
Apache or nginx version _Apache 2.x
PHP version _ 7.1

Is this the first time you’ve seen this error? _Y

Steps to replicate it:

1. start synchrinzation on client app.

The output of your Nextcloud log in Admin > Logging:

PASTE HERE

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

<?php
$CONFIG = array (
'instanceid' => 'xxxxxxxxxx'
'passwordsalt' =. ' abcdefghilxxx'
'secret' =. ' 1234567xxxx'
'trusted_domains' =>
array(
 0 => '192.168.x.x',
1 => 'localhost',
2 => 'server-01',
3=> 'xx.xx.xxx.xxx
4=> 'www.domain.xxx',
)
'datadirectory' => '/data',
'dbtype' => 'mysql',
'version' => '15.0.5.3',
'overwrite.cli.url' => 'http://xxx.xxx.xxx.xxx/nextcloud',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => ' ',
'dbtabelprefix' => 'oc_',
'dbuser' =>  'username',
'dppassword' => 'password',
'installed' => 'true',
'maintenance' => 'false',
'mail_smtpmode' => 'smtp',
'mail_smtpsecure' => 'ssl',
'mail_sendmailmode' => 'smtp',
'mail_smtpauthtype' => 'LOGIN',
'mail_smtpport' => '465',
'mail_from_address' => 'info',
'mail_domain' => 'domain.com',
'mail_smtpauth' => 1,
'mail_smtphost' => 'smtp.domain.com',
mail_smtpname' => 'info@domain.com',
'mail_smtppassword' => 'password',
);

No issues in LOG

[wook]

Have a look over here. Old and present problem once in a while.