Keeps dying and losing all my data – Blood Pressure App SmartBP Review

I entered few readings, enabled sync with Apple health kit. But after few hours app started hanging immediately at launch. I restarted phone with no luck. I uninstalled app, kept all reading in health kit. Then I reinstalled the app and try to sync with a hope of getting all my readings back... but instead of getting it back I ended up losing all my data, even from apple health app... Ended up wasting $5.99 and losing all my data...
Review by MP AMD on Blood Pressure App SmartBP.