Do not immediately press Submit again. Wait briefly, then check for a confirmation page, email, account record, or other evidence that the first request completed.
If the action could create a purchase, booking, message, or duplicate record, contact support or use an idempotent retry path when available. Save the local time and visible error with private details redacted. A timeout means you lack confirmation, not necessarily that nothing happened.
What kind of form was it?
Akousa