geolocation API suddenly failing on 'What is My Location?' tool, keeps returning weird JSON errors

man, i'm really struggling with our 'What is My Location?' tool right now, the geolocation API has just completely stopped working. it keeps throwing these bizarre json parsing errors out of nowhere, i've been trying to fix it for hours. here's what i'm seeing:

{ "error": "invalid_json_response", "code": 400 }

any ideas why this is happening all of a sudden? i am totally stuck and desperately need some expert advice on this geolocation data issue. waiting for an expert reply.