Each profile should only connect with the sensor assigned to the specific profile -Road, Indoors, Mountain etc. Now, for example, Indors connects with power sensor on a road bike which stay close to Tacx trainer
Yes. The 830 will connect to whatever sensors are paired, transmitting and in range independent of activity chosen. If it detects two of the same type, it will connect to the most recent one (I think) and you have to go into the sensors screen and check to see which was is connected, and if it's not the one you want, select the one you want and then select connect.