I've been having the same problem. I haven't been able to see a pattern, but running and re-running the same query a few times it will randomly start working again.

Jun 14 2025, 7:27 PM · Essential-Work, Data-Platform-SRE (2025.10.17 - 2025.11.07), Wikidata, Wikidata-Query-Service

Jun 12 2025

Moebeus added a comment to T396577: wdqs1022 has not been updating since June 8th at around 7 UTC.

fwiw I got outdated results from as far back May 27th today, and have been noticing stale query results at least since June 5th.

Jun 12 2025, 12:49 PM · Data-Platform-SRE (2025.06.13 - 2025.07.04), Wikidata, Wikidata-Query-Service

Oct 3 2024

Moebeus added a comment to T372702: editors are repeatedly getting logged out (August 2024).

Just got logged out again as well. For me it hasn't happened since mid August as far as I'm aware.

Oct 3 2024, 9:28 PM · Trust and Safety Product Team, MW-1.44-notes (1.44.0-wmf.4; 2024-11-19), MW-1.43-notes (1.43.0-wmf.28; 2024-10-22), Temporary accounts, MediaWiki-Platform-Team, Wikidata, MediaWiki-User-login-and-signup

Sep 1 2024

Moebeus added a comment to T279639: Wikidata search UI: Items sometimes repeat in the Search and Item dropdowns.

Annual reminder, still here :)

Sep 1 2024, 4:29 PM · Wikidata-Campsite, Discovery-Search, Wikidata

Aug 18 2024

Moebeus added a comment to T372702: editors are repeatedly getting logged out (August 2024).

Just happened to me as well; logged in when I turned off my computer last night, logged out this morning (2024-08-18).

Aug 18 2024, 11:45 AM · Trust and Safety Product Team, MW-1.44-notes (1.44.0-wmf.4; 2024-11-19), MW-1.43-notes (1.43.0-wmf.28; 2024-10-22), Temporary accounts, MediaWiki-Platform-Team, Wikidata, MediaWiki-User-login-and-signup

Jun 13 2024

Moebeus added a comment to T367366: Failed to fetch notifications: Notifications fail to load.

More errors on the page, some of these look very familiar/have been there a long time, not sure if related to the problem:

Jun 13 2024, 9:50 AM · MW-1.43-notes (1.43.0-wmf.9; 2024-06-11), Notifications (Echo), Growth-Team, Wikidata

Moebeus added a comment to T367366: Failed to fetch notifications: Notifications fail to load.

Yes. A jQuery error happens whenever I trigger the action:

Jun 13 2024, 9:45 AM · MW-1.43-notes (1.43.0-wmf.9; 2024-06-11), Notifications (Echo), Growth-Team, Wikidata

Jun 12 2024

Moebeus created T367366: Failed to fetch notifications: Notifications fail to load.

Jun 12 2024, 9:55 PM · MW-1.43-notes (1.43.0-wmf.9; 2024-06-11), Notifications (Echo), Growth-Team, Wikidata

May 30 2024

Moebeus added a comment to T366236: Labels disappearing from the UI, displaying Q and P numbers instead..

In T366236#9845259, @Fnielsen wrote:

I see that the property labels (sometimes) disappear.

May 30 2024, 7:58 AM · Regression, [Archived]Wikidata Dev Team (Wikidata.org Slice), Wikidata

Moebeus updated the task description for T366236: Labels disappearing from the UI, displaying Q and P numbers instead..

May 30 2024, 7:55 AM · Regression, [Archived]Wikidata Dev Team (Wikidata.org Slice), Wikidata

Moebeus updated the task description for T366236: Labels disappearing from the UI, displaying Q and P numbers instead..

May 30 2024, 7:46 AM · Regression, [Archived]Wikidata Dev Team (Wikidata.org Slice), Wikidata

Moebeus created T366236: Labels disappearing from the UI, displaying Q and P numbers instead..

May 30 2024, 7:45 AM · Regression, [Archived]Wikidata Dev Team (Wikidata.org Slice), Wikidata

Nov 26 2023

Moebeus added a comment to T351962: Wikidata UI - statement fields are "stacked" when editing.

Nov 26 2023, 1:10 AM · Wikidata-Gadgets, Wikidata, Wikidata-UX

Moebeus added a comment to T351962: Wikidata UI - statement fields are "stacked" when editing.

I have this same issue, looking at my Telegram history I started noticing around October 16 (in case the date means anything).
{F41536799}

Nov 26 2023, 12:02 AM · Wikidata-Gadgets, Wikidata, Wikidata-UX

Nov 5 2023

Moebeus added a comment to T279639: Wikidata search UI: Items sometimes repeat in the Search and Item dropdowns.

still there.

Nov 5 2023, 8:42 PM · Wikidata-Campsite, Discovery-Search, Wikidata

Sep 1 2023

Moebeus renamed T345474: Editing labels in Akan language ("ak") not possible? from [[User:Harmonia_Amanda/namescript.js]] stopped working today, gives weird error: "supplied language code "ak" was not recognized" to Editing labels in Akan language ("ak") not possible?.

Sep 1 2023, 8:58 PM · Wikidata

Moebeus created T345474: Editing labels in Akan language ("ak") not possible?.

Sep 1 2023, 8:46 PM · Wikidata