Hallo Christian,
you should renew the battery it seems in malefunction!
Make a R-Link-reset - start the engine, wait still R-Link has been startet, hold the On/Off-button still the screen is black. Wait for some minutes, R-Link has restarted an will run fine.
Many problems arise from undervoltage.
If the engine is switched off with the Multi-Sense "Sport" active, it will switch to Multi-Sense „Neutral“ after a long period of inactivity, unless you confirm Multi-Sense „Sport“. This is a licensing requirement.
It could be that there will be a switch to „Neutral“ without question.
I recommend installing software version 9.0.35.50x, it is the latest one. If you like you can get it.
regards
Udo