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Have you tried contacting the developer? Does it reset the printer itself or does it just stop? Also check the octoprint log files to see if there is any hints in there.
Personally i have no experience with that app, but have been successfully using Printoid for quite a while now and love it. By the looks it has all of the same functionality and I can confirm it won't stop anything when you connect remotely. There's several versions depending on the feature level you want, setup is fairly easy.
I absolutely love Printoid. I don't have an iPhone so can't comment on that front.
Printoid is a great app with active development.