[werk_ag]

@werk, what about the second matter?
Why outer temp and humidity are shown after TX unit was off?

The RX unit always keep, display and report the last received data for each sensor.
Take some time thinking about the alternatives (resetting the values after some time) and you will find that doing it will introduce more problems than benefits.
On the other hand, don't forget, we only have 2K of RAM to run all the code.