Tab went to sleep and prices are stale in WebTrader platforms

What is causing it

The browser suspended or throttled the tab to save power, so no updates arrived while it was hidden.

Why this happens

Browsers throttle or freeze hidden tabs, and operating systems suspend applications on sleep. A trading platform is a web page and gets the same treatment. When it resumes it reconnects and redraws, and the apparent price jump is simply the market having moved while nothing was being received.

The danger is the interval before the reconnection completes, when the screen still shows a price that no longer exists and an order sent against it can fill somewhere very different.

The fix, step by step

1. Never act on a price that has not ticked since you returned to the tab. Wait for movement first.
2. Reload the page after any long spell in the background instead of trusting what is drawn.
3. Keep the platform in its own window and leave it visible rather than buried in a stack of tabs.
4. Turn off memory or energy saving for this site if your browser allows a per-site exception.
5. Stop the computer sleeping while you have positions open, using your operating system's power settings.
6. Use resting stop and limit orders for anything critical, so nothing depends on the screen being live.
7. Consider your provider's mobile app as a second view when you must be away from the machine.

How to confirm it is fixed

Leave the tab hidden for several minutes, return, and confirm prices resume ticking within a second or two rather than sitting still.

Stopping it happening again

Give the platform a dedicated, visible window, keep the machine awake while exposed, and place protective orders rather than watching.