Hi! I'm JF002, the creator of InfiniTime! I received a PM about this app, and I have to say I'm really happy to know that a companion app is being developed for UBPorts, and to see so many PineTime users in this community!
I see that many of you experience issues connecting the watch to the phone. We are aware of issues around BLE connectivity in InfiniTime: unexpected disconnections and difficulties to pair the watch to the phone are the most common. What are currently trying to analyze those issues, but debugging BLE is really not easy. You can follow our discussions here, or join us in the PineTime chat rooms (you'll find the link on the pine64 website.
Until we find fixes for these issues, the best workaround is to reset the watch (keep the button pushed for ~10s). BLE should be working again after the reboot.
Let me know if I can be of any help with this project! I'll also probably try this app soon on my PinePhone 