Trading Post Down for Over a Week
It was a bit erratic yesterday for me, then it was down for maintenance for a couple of hours but seems to be operational again. It’s possible your client has become corrupted and may need to be started with the /repair option (apologies if you’ve already thought of that). Best of luck.
You might try clearing your cache. Instructions can be found via the ‘Support’ link above/below and ‘Search cache’.
Or here’s the link: https://help.guildwars2.com/entries/92949348-Trading-Post-Troubleshooting
Good luck.