What are you doing exactly when this error occurs? Are you using a browser? or Running an app?
Did you install any new apps (or app updates) just prior to this error occurring? If so, the new app/update, could actually be the cause of your problem. You may wish to uninstall any new apps/updates done just prior the the problem and then restart the phone. This may fix your problem. If not, then I would suggest uninstalling and reinstalling the app you are getting the error from.