When I enter into the base menu, the can bus card: CAP-01 flash red green. Is this a normal behavior?

Reason
If you enter the base menu, the bp306 stop the CAN2 interface. If there is no group connection, the CAP gets no messages from the bp306 and starts the auto baud detection (flashing red and green).

Solution
This is a normal behavior. It's not a bug, it's a feature ;-)