Regarding Volkhov, I think it is standard behavior when you are in 75km AND BR mode.

4 – RPK (Radio transmiter for missile commands)
Battle value: Two positions – left: „Dummy load”; Right „Antenna”. It is used to transmit fake launch signals to enemy formations, forcing them to break the battle formation and drop it’s loads.The RPK system is continuously calculating and creating the missile guidance commands, even when they are not launched.Those signals could be sent to the dummy load, or emitted by the P16 antenna.
With this switch, you can select between dummy load (EKV) or the P16 (ANT).When missile is launched, this switch is overruled and the commands are emitted via the P16. If the P16 is selected (manually or automatically), it is indicated by the green lamp.At the Volkhov, if the system is in BR and 75 km mode, the RPK signals are automatically sent to the P16 to frighten the enemy. In all other modes, you may use it manually at will.
RPK - EKV/ANT switch should not be used in real combat, as the BR/75 km mode has the same effect.