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This thread is resolved. Here is a description of the problem and solution.

Problem:
You have installed WPML on your site and are experiencing intermittent unavailability of the REST API. The REST API becomes unavailable across the entire site for about one minute, then returns before going offline again for a few minutes.
Solution:
We have identified that deactivating the WPLoyalty - WooCommerce Loyalty Points, Rewards and Referral Pro plugin resolves the issue. This plugin is currently not compatible with WPML. We recommend contacting the plugin author for more insights on the issue and to check if they can provide a solution. Meanwhile, if the plugin author indicates any direct relation of WPML to the issue, please inform us.

This solution might be outdated or not applicable to your case. We highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If the issue persists, please open a new support ticket at WPML support forum.

This is the technical support forum for WPML - the multilingual WordPress plugin.

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This topic contains 5 replies, has 0 voices.

Last updated by Lucas Vidal de Andrade 3 weeks, 2 days ago.

Assisted by: Lucas Vidal de Andrade.

Author Posts
November 19, 2025 at 1:27 pm

julienM-71

Background of the issue:
I just installed WPML on my site, and I am experiencing an issue where the REST API becomes unavailable intermittently. My WPML version is up to date, and I don't have any caching or security plugins enabled.

Symptoms:
The REST API becomes unavailable across the entire site for approximately one minute, then comes back online before becoming unavailable again for a few minutes.

Questions:
Do you have a solution for the REST API availability issue?

November 19, 2025 at 2:43 pm #17592369

julienM-71

The staging version is ready :

- hidden link

November 19, 2025 at 4:30 pm #17592752

Lucas Vidal de Andrade
WPML Supporter since 11/2023

Languages: English (English )

Timezone: Europe/Vienna (GMT+01:00)

Hello there,

After analyzing your website, I noticed that deactivating the WPLoyalty - WooCommerce Loyalty Points, Rewards and Referral Pro stops the 404 issue from happening. I checked, and this plugin is not WPML compatible.

In this case, I recommend you to reach out to the plugin author to see if they have any hints on why the issue is happening. I'll leave this ticket open, in case they notice that WPML had any direct relation to the cause of the issue. Please let me know what they say.

November 19, 2025 at 10:37 pm #17593692

julienM-71

Hi Lucas,
Thank you for your help, i will contact the plugin author.
I'll let you know.

November 25, 2025 at 2:44 pm #17608547

julienM-71

Hi Lucas,

The WPLoyalty support got back to me.
The issue is due to a conflict between WPML and WP Loyalty when WPLoyalty attempts to flush rewrite rules.

I have obtained an updated package to resolve the issue; the code changes will be included in the next official release.

November 26, 2025 at 10:57 am #17611074

Lucas Vidal de Andrade
WPML Supporter since 11/2023

Languages: English (English )

Timezone: Europe/Vienna (GMT+01:00)

That's great to hear 🙂 Thank you so much for sharing your results with us. Let me know if you have any other questions.