Well, things sort of worked. I made sure bluetooth was turned off of my iPhone 4s and ancient iPad which I run the AmmoCam via wifi (rock solid). Connected up with my 6s running iOS 11.4 and it was solid for about three quarters of an hour - about 35+ rounds of 6.5CM. I shoot 5 rounds then start a new series as I am testing loads for the Hornady 147gr ELD-M bullet. Barrel cooling breaks each 10-15 rounds as necessary. Anyway, somewhere within series 7 something decided to disconnect. The iPhone had something like 'you need to select a device' message in the middle of the labradar screen when I looked at it after the fifth shot. &*&(%! I waited for the timeout so that the labradar would disarm itself and reconnected with the app. I got the data I wanted, started a new series and somewhere within series 8 it quit again. *()^&%#%#! Instead of waiting the 90 seconds I have it set to for disarming, I got up and had to press the arm button twice to get it disarmed. Weird, I have only had to press it once before.
So, I put away the 6s after unloading the labradar app and disabling bluetooth on it (make sure it wasn't going to interfere) and fired up my old iPhone 4s running iOS 9.1. It connected without issue and I started shooting series 9. When I looked at it, it was disconnected. I reconnected after the labradar arm time-out and it disconnected during series 10. Reconnected again after the labradar disarmed and got the data. Once I finished this first set of 50, I took a coffee break and scowled at the labradar while cussing it out a little. I know it didn't do anything, but it made me feel a little bit better. Once coffee break was over I sat down and shot the next set of 50 rounds with barrel cooling breaks and it never disconnected once. I don't know why.
Power on both iPhones was good, never below 50%. Neither was set to auto-lock. Power on labradar was pretty close to 100% throughout. I have a large capacity battery bank powering it now. Don't know why it would disconnect with both iPhones. Not trying it with the iPad. I need the big video display to see where I am hitting. If the seeing is good then I can see where I am hitting through the scope but a lot of the time I can barely see the targets, 3/4" stick-on dots, as the air is seething away in the heat and wind.
Good points:
Labradar continues to gather velocity data even after a disconnect.
Can reconnect after the labradar is disarmed, either manually or via time-out.
Bad points:
Can't figure out WHY it disconnects.
No consistency or common feature I can figure out.
It is somewhat inconvenient but more seriously, frustrating!