503 Error Page
If you're seeing 503 errors on the studies page this is because you're requesting this page too frequently, so the web server is limiting your access.
If you're using a page monitor, please turn this off temporarily to see if this solves your issue. It should only take ~1min to reset your request limit.
You can use page monitors but please limit the requests to less than 1/min.
If you're using Prolific Assistant please note that the default time is in seconds so you'll need to set the check time to > 60.