Sudden drop in graphs at the same time every day

Hello, I’ve been seeing a drop in my network devices (with different locations) lately, exactly between 19:00 - 19:10. During these hours, it is not possible to drop this much in any of my networks. When I look at the logs, there is no anomaly or anything unusual, when I check the cron jobs, there is no active cron running at that time at 19:00 (UTC+3). Also server resources are fine & free during these interval.

The 24-hour charts of 3 different locations are as follows;

Location 1

Location 2

Location 3

What could be the probable reason?

The output of ./validate.php

Component | Version
--------- | -------
LibreNMS  | 22.3.0-35-g02b5ef797
DB Schema | 2022_04_08_085504_isis_adjacencies_table_add_index (236)
PHP       | 8.1.4
Python    | 3.6.9
MySQL     | 10.5.15-MariaDB-1:10.5.15+maria~bionic
RRDTool   | 1.7.0
SNMP      | 5.7.3

[OK]    Composer Version: 2.3.4
[OK]    Dependencies up-to-date.
[OK]    Database connection successful
[OK]    Database schema correct

Thanks in advance for any suggestion.

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