Web purchasing portal functionality issues

We are currently having a number of issues with the web purchasing portal. The issues range from error 503 to expired tokens while we are in the middle of creating or approving a requisition to bad gateway messages when trying to save a requisition. Multiple users have been getting the 503 error. Sometimes restarting and/or clearing their cache will fix, but sometime they just have to wait and try again the next day. I'm wondering if anyone else is experiencing these issues within the last 2-3 weeks.