Constant “experiencing heavy load” error while trying to use classic voice mode

using the latest version of the ChatGPT iOS app, GPT 4o and standard voice mode, I am getting the “experiencing heavy load. Try again later” error message repeatedly as of the past 15 minutes or so. Any known issues?

Update: now it has switched to the “sorry, I couldn’t hear what you said” error despite my audio setup working just fine. I even switched to advanced voice mode and that understood and responded with no problems, so something is definitely amiss with standard mode