To reply you :
No, it does not start occuring after an update
No, I do not see any error. I received the email from wordpress but I can access my website and nothing looks wrong.
Here is my Site health info :
### wp-core ###
version: 5.3.2
site_language: fr_FR
user_language: en_US
timezone: Europe/Paris
permalink: /%postname%/
https_status: true
user_registration: 0
default_comment_status: open
multisite: false
user_count: 1
dotorg_communication: true
### wp-paths-sizes ###
wordpress_path: /home/rienasemettrefr/public_html
wordpress_size: 945.05 MB (990956043 bytes)
uploads_path: /home/rienasemettrefr/public_html/wp-content/uploads
uploads_size: 4.69 GB (5038882359 bytes)
themes_path: /home/rienasemettrefr/public_html/wp-content/themes
themes_size: 3.15 MB (3303627 bytes)
plugins_path: /home/rienasemettrefr/public_html/wp-content/plugins
plugins_size: 232.17 MB (243444798 bytes)
database_size: 187.21 MB (196299122 bytes)
total_size: 6.03 GB (6472885949 bytes)
### wp-dropins (1) ###
advanced-cache.php: true
### wp-active-theme ###
name: Twenty Twenty (twentytwenty)
version: 1.1
author: the WordPress team
author_website: https://wordpress.org/
parent_theme: none
theme_features: post-thumbnails, woocommerce, wc-product-gallery-zoom, wc-product-gallery-lightbox, wc-product-gallery-slider, menus, title-tag, editor-styles, align-wide
theme_path: fake
### wp-themes-inactive (1) ###
Rienasemettre v.2015: version: 1.1.10, author: WPZOOM
### wp-mu-plugins (2) ###
ManageWP - Worker Loader: author: GoDaddy, version: (undefined)
plugin load filter [plf-filter]: version: 3.1.1, author: enomoto@celtislab
### wp-plugins-active (44) ###
** Add Font in Admin: version: 1.0.0, author: Guillaume LORAIN
** Add Media Size: version: 1.0.0, author: Guillaume LORAIN
** Count Post Visit in admin: version: 1.0.0, author: Guillaume LORAIN
** Doshortcode Link: version: 1.0.0, author: Guillaume LORAIN
** Gallery Link to media file by default: version: 1.0.0, author: Guillaume LORAIN
** Remove Next Link: version: 1.0.0, author: Guillaume LORAIN
a3 Lazy Load: version: 2.3.1, author: a3rev Software
Admin Columns Pro: version: 5.0.2, author: AdminColumns.com
Admin Columns Pro - Toolset Types: version: 1.5.4, author: Admin Columns
Advanced Ads: version: 1.17.3, author: Thomas Maier, Advanced Ads GmbH (latest version: 1.17.4)
AZ Glossary Taxonomy Index: version: 1.07, author: Ivano Di Biasi & Giuseppe Liguori
Better Search Replace: version: 1.3.3, author: Delicious Brains
Caldera Forms: version: 1.8.10, author: Caldera Labs (latest version: 1.8.11)
Change Last Modified Date: version: 1.3, author: Zarko
Code Snippets: version: 2.14.0, author: Code Snippets Pro
Duplicate Post: version: 3.2.4, author: Enrico Battocchi
Easy FancyBox: version: 1.8.18, author: RavanH
Google Authenticator: version: 0.52, author: Ivan Kruchkoff
LiteSpeed Cache: version: 2.9.9.2, author: LiteSpeed Technologies
ManageWP - Worker: version: 4.9.3, author: GoDaddy
MC4WP: Mailchimp for WordPress: version: 4.7.5, author: ibericode
OMGF: version: 2.5.0, author: Daan van den Bergh
Oxygen: version: 3.2, author: Soflyy
Oxygen Gutenberg Integration: version: 1.2, author: Soflyy
plugin load filter: version: 3.1.1, author: enomoto@celtislab
Post Expirator: version: 2.4.0.1, author: Aaron Axelsen
Powerful Posts Per Page: version: 1.1.0, author: Toro_Unit
Public Post Preview: version: 2.9.0, author: Dominik Schilling
Rank Math SEO: version: 1.0.39.2, author: Rank Math
Really Simple SSL: version: 3.2.9, author: Rogier Lankhorst, Mark Wolters
Regenerate Thumbnails: version: 3.1.3, author: Alex Mills (Viper007Bond)
Resize Image After Upload: version: 1.8.6, author: ShortPixel
Safe Redirect Manager: version: 1.9.3, author: 10up
Site Kit by Google: version: 1.4.0, author: Google
Social Snap Lite: version: 1.1.8.2, author: Social Snap, LLC
Toolset Forms: version: 2.5.5, author: OnTheGoSystems
Toolset Types: version: 3.3.10, author: OnTheGoSystems
Toolset Views: version: 3.1.0, author: OnTheGoSystems
UpdraftPlus - Backup/Restore: version: 2.16.5.1, author: UpdraftPlus.Com, DavidAnderson (latest version: 2.16.22.0)
Wordpress Pinterest Automatic: version: 4.14.1, author: ValvePress
WordPress Popular Posts: version: 5.0.2, author: Hector Cabrera
WP First Letter Avatar: version: 2.2.6.1, author: Dev49.net (latest version: 2.2.8)
WP No External Links: version: 4.3, author: steamerdevelopment
WProofreader: version: 2.5, author: WebSpellChecker
### wp-plugins-inactive (8) ###
Insert Headers and Footers: version: 1.4.5, author: WPBeginner
Mihdan: No External Links: version: 4.5.1, author: Mikhail Kobzarev
OneSignal Push Notifications: version: 2.1.1, author: OneSignal
Relevanssi: version: 4.6.0, author: Mikko Saari
Responsive Gallery Grid: version: 2.3.1, author: Jules Colle, BDWM
WordPress Editorial Calendar: version: 3.7.5, author: Colin Vernon, Justin Evans, Joachim Kudish, Mary Vogt, and Zack Grossbart
WordPress Importer: version: 0.7, author: wordpressdotorg
Yet Another Related Posts Plugin: version: 5.1.2, author: YARPP
### wp-media ###
image_editor: WP_Image_Editor_GD
imagick_module_version: Not available
imagemagick_version: Not available
gd_version: 2.2.5
ghostscript_version: 9.25
### wp-server ###
server_architecture: Linux 3.10.0-962.3.2.lve1.5.26.7.el7.x86_64 x86_64
httpd_software: LiteSpeed
php_version: 7.4.3 64bit
php_sapi: litespeed
max_input_variables: 1000
time_limit: 360
memory_limit: 512M
max_input_time: -1
upload_max_size: 16M
php_post_max_size: 32M
curl_version: 7.62.0 OpenSSL/1.0.2k
suhosin: false
imagick_availability: false
htaccess_extra_rules: true
### wp-database ###
extension: mysqli
server_version: 10.2.31-MariaDB-cll-lve
client_version: mysqlnd 7.4.3
### wp-constants ###
WP_HOME: undefined
WP_SITEURL: undefined
WP_CONTENT_DIR: /home/rienasemettrefr/public_html/wp-content
WP_PLUGIN_DIR: /home/rienasemettrefr/public_html/wp-content/plugins
WP_MAX_MEMORY_LIMIT: 512M
WP_DEBUG: false
WP_DEBUG_DISPLAY: false
WP_DEBUG_LOG: false
SCRIPT_DEBUG: false
WP_CACHE: true
CONCATENATE_SCRIPTS: undefined
COMPRESS_SCRIPTS: undefined
COMPRESS_CSS: undefined
WP_LOCAL_DEV: undefined
DB_CHARSET: utf8
DB_COLLATE: undefined
### wp-filesystem ###
wordpress: writable
wp-content: writable
uploads: writable
plugins: writable
themes: not writable
mu-plugins: writable