Yes, Android OS resets the LDAC bitrate to the Adaptive(Best Effort) whenever the LDAC receiver reconnected.
It doesn't look pleasant, but unfortunately, there's no way to fix it at the receiver.
However, Adaptive(Best Effort) would be quite a reasonable choice, as long as you can take the initial startup low bitrate around 10 seconds.
At Adaptive(Best Effort) mode, LDAC starts with 330kbps and shortly goes up to 660kbps in most cases.
With some old version of LG smartphones and the devices with lower resolution display, LDAC quickly goes up to 990kbps eventually.
Galaxy S10 can't support LDAC 990kbps while the display is on. With Galaxy S10, LDAC 990kbps is available only with the screen off.
It seems that the high-resolution display system interferes with wireless communication.
Anyway, we'll provide a real-time LDAC bitrate monitoring feature.
5K reports the current bitrate to the mobile app, and the app displays and plots the bitrate graph.
We hope this feature would help you to use adaptive bitrate without a worry in most cases.