Hi @sf500 – thanks for posting!
We see that error occasionally in Sandbox whenever there’s a high load of requests and our service has an error. I would like to learn how you’re using the Sandbox environment from a testing perspective, and see if that has anything to do with there being a frequent occurrence of such errors.
We generally recommend not using Sandbox as a part of automated tests that run often. If that isn’t an option, you could implement retry logic or build a fake Dwolla to test against similar to this blog post: https://www.dwolla.com/updates/building-open-source-software/
Hope that helps. Do let me know!