My BTR5 came with 1.04, I upgraded to 1.06 first thing - early days with devices usually require a few updates to get the bugs worked out.
I haven't had any operational weirdness in 100 hours+ usage on Note 10+ (BT 5.0) or Windows 10 (BT 4.2), mostly on USB but lots of BT as well.
The App use through the combined Music app is a pain. Sometimes it doesn't connect "right" and I can't get into the controls. It takes a disconnect / reconnect to fix. Once into the Control part of the app I find sometimes the changes don't save - that also coincides with the Codec selection not working. I disconnect and reconnect again. It didn't take long for me to figure out what settings I want and eventually I got them saved and I don't go into the Control app any longer. Changes through the interface on the BTR5 - like gain mostly are enough once I got the app settings to settle in.
Here's my settings, and FYI the app connected on it's own without prompting from me and shows Codecs so it's a good connection, it must have heard me complaining about it
Charge: Always
Car mode: Off
Idle Poweroff: 3 min
I don't mind powering on as I usually have constant music or audio except when I am done, after which it can turn off quickly. If you don't like powering on after idle power off then I'd set it to Off (0) and do it manually - but then there's the danger you will forget and all drain all the power on battery in between sessions.
Bluetooth codecs: all selected
Selecting all of them hasn't caused a problem so far, the BTR5 always connects at the best available from the device and it does it quickly so I don't feel like I need to limit the choices available. In the event I get a device that requires the codecs I don't normally use they will be available without getting into the app to enable them.
Input Priority: USB DAC first
It's nice that setting allows me to automatically disconnect from USB and then continue listening with BT automatically switched on. I've found I can connect to both USB DAC and BT Control, but maybe that's where the problem has been in connecting and settings. Just now I disconnected USB from PC and connected BT from phone and it worked first thing.
LCD Power off: 10 seconds
That's been enough for me to scroll though, think about the change, and then I don't need it on. LCD Dimmer is only settable on the device, and I have it set to 3 - I don't need more, and when I first got it I set it to 1 which is all I need indoors.
The BTR5 for me has been a smooth and satisfying experience.