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BLE Stack V1.2.1 scanning problem

Hi

I've just updated from stack V1.1a to the stack V1.2.1. I used the SimpleBLECentral as starting point for my application.
The new stack works, but with a few problems. If I restart the scanning immediately after a discovery has been finished, a few times in a row, then the stack crashes. If I set a timer to restart scannig automatically, then i need at least a delay of 1second to pervent the crash.Manual over a Uart instruction to restart scanning, I'am not able to reproduce the crash. With stack V1.1a, the problem did not exist.
Any idea what
could be the problem
?

In the release notes V1.2 is written:
- Multi-role and combo-role support has been enhanced. The BLE stack can now
  support simultaneously advertising and/or scanning while in a connection as
  either a master or a slave. This allows for a central device to perform
  device discovery while in a connection.

Is there a way for scanning other devices in central role while beeing in a connection with one device?
If yes, which command can be used?