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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isnât supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 12.0.2): 15.0.10
Operating system and version (eg, Ubuntu 17.04): Ubuntu 18.04
Apache or nginx version (eg, Apache 2.4.25): 2.4.29
PHP version (eg, 7.1): 7.2
The issue you are facing:
Whenever file synchronization takes place (even if the files are really small <1mb) the upload starts slow at something like 120kb/s and goes down further, after a couple of seconds the whole internet is âoverloadedâ and the Wifi drops. I canât connect to any websites from any machine on the same network whatsoever. Itâs like whenever file synchronization takes place it overloads the whole bandwidth. Even though I never have any complaints about the network on any other occasion. I can download games from steam with 12mb/s easily for hours straight and not have a single problem.
Is this the first time youâve seen this error? (Y/N): N
Steps to replicate it:
- Put file in any folder
- Start synchronization
- Watch internet drop
The output of your Nextcloud log in Admin > Logging:
[webdav] Fatal: Sabre\DAV\Exception\BadRequest: expected filesize 7432311 got 1212416 at <<closure>>
0. /snap/nextcloud/14827/htdocs/apps/dav/lib/Connector/Sabre/Directory.php line 156
put(null)
1. /snap/nextcloud/14827/htdocs/3rdparty/sabre/dav/lib/DAV/Server.php line 1096
createFile("04 Crime Pays.mp3", null)
2. /snap/nextcloud/14827/htdocs/3rdparty/sabre/dav/lib/DAV/CorePlugin.php line 525
createFile("files/krulvis/M ... 3", null, null)
3. <<closure>>
httpPut(Sabre\HTTP\Reque ... "}, Sabre\HTTP\Response {})
4. /snap/nextcloud/14827/htdocs/3rdparty/sabre/event/lib/EventEmitterTrait.php line 105
call_user_func_array([Sabre\DAV\CorePlugin {},"httpPut"], [Sabre\HTTP\Requ ... }])
5. /snap/nextcloud/14827/htdocs/3rdparty/sabre/dav/lib/DAV/Server.php line 479
emit("method:PUT", [Sabre\HTTP\Requ ... }])
6. /snap/nextcloud/14827/htdocs/3rdparty/sabre/dav/lib/DAV/Server.php line 254
invokeMethod(Sabre\HTTP\Reque ... "}, Sabre\HTTP\Response {})
7. /snap/nextcloud/14827/htdocs/apps/dav/lib/Server.php line 301
exec()
8. /snap/nextcloud/14827/htdocs/apps/dav/appinfo/v2/remote.php line 35
exec()
9. /snap/nextcloud/14827/htdocs/remote.php line 163
require_once("/snap/nextcloud ... p")
PUT /remote.php/dav/files/krulvis/Music/Freddie%20Gibbs%20-%20Bandana%20(2019)/04%20Crime%20Pays.mp3
from 192.168.1.1 by krulvis at 2019-07-24T20:25:56+00:00
Those get repeated a couple of times.
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'apps_paths' =>
array (
0 =>
array (
'path' => '/snap/nextcloud/current/htdocs/apps',
'url' => '/apps',
'writable' => false,
),
1 =>
array (
'path' => '/var/snap/nextcloud/current/nextcloud/extra-apps',
'url' => '/extra-apps',
'writable' => true,
),
),
'supportedDatabases' =>
array (
0 => 'mysql',
),
'memcache.locking' => '\\OC\\Memcache\\Redis',
'memcache.local' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => '/tmp/sockets/redis.sock',
'port' => 0,
),
'passwordsalt' => '####',
'secret' => '####',
'trusted_domains' =>
array (
0 => 'localhost',
1 => '###.###.###.##',
2 => 'krulvis.##',
3 => '###.krulvis.###',
),
'datadirectory' => '/var/snap/nextcloud/common/nextcloud/data',
'overwrite.cli.url' => 'http://localhost',
'dbtype' => 'mysql',
'version' => '15.0.10.0',
'dbname' => 'nextcloud',
'dbhost' => 'localhost:/tmp/sockets/mysql.sock',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'nextcloud',
'dbpassword' => '##',
'installed' => true,
'instanceid' => 'ocuqefo6pu9k',
'mail_from_address' => 'joep',
'mail_smtpmode' => 'php',
'mail_smtpauthtype' => 'LOGIN',
'mail_domain' => 'krulvis.####',
'loglevel' => 2,
'maintenance' => false,
);
The output of your Apache/nginx/system log in /var/log/____:
Apache2 logs are empty.
UPDATE
After some fiddling I decided to remove the snap package of Nextcloud and get some more control by installing nextcloud 16 manually. This however did not get rid of the aforementioned issue and I will thus post the settings that Nextcloud is currently installed with:
Nextcloud version (eg, 12.0.2): 16.0.3
Operating system and version (eg, Ubuntu 17.04): Ubuntu 18.04
Apache or nginx version (eg, Apache 2.4.25): 2.4.29
PHP version (eg, 7.1): 7.2
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'oc4addqwxj5f',
'passwordsalt' => '###',
'secret' => '###',
'trusted_domains' =>
array (
0 => '###.krulvis.###',
),
'datadirectory' => '/nextcloud-data',
'dbtype' => 'mysql',
'version' => '16.0.3.0',
'overwrite.cli.url' => 'http://###.krulvis.###',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => 'nextcloud',
'dbpassword' => '###',
'installed' => true,
'memcache.local' => '\\OC\\Memcache\\APCu',
'mysql.utf8mb4' => true,
'maintenance' => false,
);
