When i start the sdcard recording , the the reaction time of the m20d screen is getting very slow.
During recording I also playback audio from the sdcard.
That means when want to use e. g. the faders, the m20d needs some time to react.
When i stop recording or stop audio playback, then everything is ok.
My sdcard is class 10.
That means simultanious sdcard recording and sdcard audio playback slows down the M20d
You can see the effect, when you watch the recording time counter in der record menu.