Constant issues using external microphones

Using this app for live music performances is impossible unless you use the built in mic on your phone or use a computer. Audio only works about 25% of the time. When it does work its distorted or will stop working after a minute or two. Ive had no issues at all using the same set up for FB live, Ustream or YouTube live. @PeriscopeHelp was no help at all. The audio problem is inherent in the program code. Nothing but frustration.
Update: I was able to purchase some equipment and use a third party app to solve the audio issues. I enjoy scoping again.

Jeve Stones about Periscope Live Video Streaming, v1.11.7