I purchased the mega pack but the 8 hr sleep track stops after a minute in the Gumroad app. I’ve uninstalled  and reinstalled with the same results.
Hey! Sorry I'm just seeing this now, 3 months later ... this isn't really the right channel for Gumroad support :) 
If you haven't sorted the issue, please send me a note! https://www.jodyhatton.com/contact/
rescurat