I have an android and the screen will appear as a dropped call but the call has just transferred back to handset mode...
Driving down the road my screen literally froze so i couldn't adjust the touch screen, climate, anything...my power also drastically dropped in my vehicle so I literally slowed down...this happened 3 times on the highway at different time.....

 

This is not a Bluetooth issue ... something happening on the Lexus side. Have you been able to reproduce ?

 

That sounds like the car's going into limp mode for some reason.Reducing power and cutting off certain unnecessary features to protect them and reduce load on the car. I'd recommend taking it to a mechanic with a scan tool, or use one yourself to try and diagnose the issue.

 

Yes, that is what Lexus stated for highway issues...but again to me I know Lexus have to be aware of it... It's a flaw in the design...what are the odds to have 3 Lexus vehicles all do it