Other's activity does not refresh anymore

[daladim]

Steps to reproduce

1. Open Activity app
2. Click on "other's activity" ("L'activité des autres" in French)

Expected behaviour

The page that load should display the most recent activities made by users other than me.

Actual behaviour

Since 5 months ago, displayed activities are stuck and do not refresh anymore. The most recent activities date back from 5 months ago. Of course, there is other's activity (the regular activity feed does show them, other's activity happen everyday). It looks like this activity is successfully logged into the activity DB, but the "display only the others" filter has some bug. Note : it already happened on an old installation (activities was fine, other's activity got stuck at some date after a few months of usage). Reinstalling (a newer major release of) owncloud, with fresh databases temporary fixed the issue, but no luck, this happened again.

Server configuration

Operating system: Raspbian 8, kernel 4.4.43-v7+

Web server: Apache/2.4.25 (Raspbian)

Database: MySQL 5.5.54-0+deb8u1

PHP version: PHP 7.0.15-1

ownCloud version: ownCloud 9.1.4 (stable)

Where did you install ownCloud from: Raspbian package owncloud-files 9.1.4-1.1

Signing status (ownCloud 9.0 and above):

- core
	- EXTRA_FILE
		- fix-permissions.sh (I added it myself, copied from https://doc.owncloud.org/server/9.1/admin_manual/installation/installation_wizard.html)

Raw output
==========
Array
(
    [core] => Array
        (
            [EXTRA_FILE] => Array
                (
                    [fix-permissions.sh] => Array
                        (
                            [expected] => 
                            [current] => b87f2e60689ea803404373c94de5e002485affd072877bf1bf91284044ebc4cf03ad341f56c02ce049177ecaf16c088f37c772f02e62aee06ed6c3cd0579af30
                        )
                )
        )
)

List of activated apps:

Enabled:
  - activity: 2.3.2
  - calendar: 1.4.1
  - comments: 0.3.0
  - configreport: 0.1.1
  - contacts: 1.5.1
  - dav: 0.2.7
  - federatedfilesharing: 0.3.0
  - files: 1.5.1
  - files_pdfviewer: 0.8.1
  - files_sharing: 0.10.0
  - files_texteditor: 2.1
  - files_trashbin: 0.9.0
  - firstrunwizard: 1.1
  - gallery: 15.0.0
  - notes: 2.0.2
  - notifications: 0.3.0
  - provisioning_api: 0.5.0
  - tasks: 0.9.4
  - templateeditor: 0.1
  - updatenotification: 0.2.1
Disabled:
  - encryption
  - external
  - federation
  - files_antivirus
  - files_external
  - files_versions
  - files_videoplayer
  - ownnote
  - systemtags
  - user_external
  - user_ldap

The content of config/config.php:

{
    "system": {
        "updatechecker": false,
        "instanceid": "oclix696c8bp",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "**my domain**"
        ],
        "datadirectory": "\/var\/www\/owncloud\/data",
        "overwrite.cli.url": "https:\/\/**an old value that does not match my actual server domain name anymore**",
        "dbtype": "mysql",
        "version": "9.1.4.2",
        "dbname": "owncloud",
        "dbhost": "localhost",
        "dbtableprefix": "oc_",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "logtimezone": "UTC",
        "installed": true,
        "asset-pipeline.enabled": true,
        "theme": "",
        "loglevel": 2,
        "maintenance": false
    }
}

Are you using external storage, if yes which one: a local, external ext4 HDD

Are you using encryption: no server-side encryption, but HTTPS transport encryption

Are you using an external user-backend, if yes which one: no

Client configuration

Irrelevant, (at least) both Safari and Firefox on Mac show this bug

Logs

ownCloud log (data/owncloud.log)

Nothing appears in data/owncloud.log Nothing appears in apache/error.log

Browser log

Irrelevant

Thanks anyway for your awesome work on Owncloud :)