Impossible, anything ????
Are you talking flight searches or site searches?

Your referenced case is Advance Search with PlusPoints request. Do you have any other options in the Advance Search? The PlusPoints / Upgrade combined with other options has been a known issue for a long time. Advance Search for other options works fine for me and appears for many other.

FTer actions like too many, too frequent searches, block by Akamai, seems to be the main cause reported here of this message - hence the suggestion to switch tabs or browsers.