@Jlaneme you may garnish better responses if you share more particulars, such as what version of a device (I'm assuming a phone) that you're using (Android / iOS) and what version of the software and firmware. You've twice mentioned app store updates, but not which app store, and twice mentioned disconnecting Bluetooth and uninstalling the app, but not which device you'd uninstalled and reinstalled it on. Do you have other devices such as a computer or tablet you can try syncing with? Do you have other trackers besides the zip that sync successfully? Based on what you've shared so far, I'm unfortunately without suggestions outside of checking your phone has free space for caching, as if an Android is full, sometimes apps can't sync. Again, unsure if Android or Apple. Good luck!
