Another thing to bear in mind if you’re within the Apple ecosystem is that iCloud syncs Bluetooth connections across all of your devices you’ve signed in to with your AppleID. In some cases, automatic re-connection behavior can be modified but the device cannot be forgotten without removing it from all devices. ¯\_(ツ)_/¯
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I just turn off Bluetooth temporarily 
@mrtopher1980 - No, actually it wasn’t. I’ve never used TR on my phone with the trainer. I use it for calendar and workout review, never connected to the trainer. In fact, the Tacx doesn’t even pair with the phone at all in the same way other devices do. Looking in the list of paired devices, past and present, connected and not, it’s not there. The phone is aware of the trainer, as I’ve used it with the Tacx app a couple of times to check settings, but that’s all.
@kevistraining- Agreed, sort of. While I don’t do rides with the phone app, what started this was looking at the app for other reasons during a long Z2 ride. I just wanted to browse my calendar, and my computer is not in easy reach. The phone is on my bars running the Zwift companion, so it’s easy to just pop open the TR app and have a look. That’s when it grabs the trainer and things get … interesting.
@HamFisted - That may be (I’ve seen it with other paired devices, like headphones), but it still doesn’t excuse the TR app from its bad behavior. There’s no reason for TR to care about the existence or connection status of a trainer until the workout is actually loaded and ready to go. Until that point, it should completely ignore all connected devices (PM, Trainer, HRM, etc). There’s just no reason to connect to a device until that device is going to be used.
My point is that now after the recent changes to the mobile website you can do all that just as easily on your phone by bookmarking the web page.
The mobile web site and mobile app are virtually identical now…. just without the trainer control…
So don’t tell me no when the same was yes…
Spin down? Making sure all connections are setup? There are plenty of reasons to make sure the connections are set before loading a workout. I don’t think I’ve ever loaded a workout before doing the connection.
Your iPhone grabbed it because you just admitted that it’s been connected before. That’s still not a TR app problem, it’s a your phone and trainer problem because they have in fact been connected and the trainer was on so the phone grabbed it. Has nothing to do with trainerroad
The TR app isn’t ideal because not only does it link to the trainer when not in a workout - it actually seems to send a setpoint value - you can check this if you start pedalling on your trainer with no controlling device and then load up the TR app and you will feel the resistance change. There could be improvements there to stop this issue…
That said…
I dont want them to change anything at all with how sensors pair on the app because it’s the most rock-solid app when it comes to pairing and I dont what then to mess that up by accident 
Instead users should be encouraged to use the mobile web page which offers almost all the same functionally as the app and with the same layout unless they actually want to run a workout.
The main point is that the phone would potentially take control of the opened zwift, the tacx app or anything else that might be able to use it.
The problem is not explicitly something TR is doing wrong and or has a fix.