Not sure if this is your problem too, but I have found the app to crash on my iPod touch 5th gen when a sound that is "too loud" is picked up. For instance, setting a tool town, bumping the phone, setting it down too hard, etc. Any LOUD noise (not pitch). It instantly crashes and all things are lost. If the log even registers anything, It registers as a negative value (I think like -0.01 or something) on the last "pitch" recorded. I don't have a screenshot handy that shows this. I haven't been using it lately for this very reason.