HDP 4424. Channel 4 stops working when changing the mode of channels 1 and 2

Vaasiaa

Set channels 1 and 2 to serial or parallel mode. Set the voltage on channel 4 and press the button to turn on the channel or all channels.
The channel will be turned on, but there will be no output voltage and the screen will indicate 0 volts. If before changing the mode of channel 1 or 2, channel 4 was turned on, then it will no longer turn off.
Is it possible to correct this behavior?