MP Freeze on arm

It happens sometimes that MP freezes for 5-6 seconds on arm, everything frozen on display including telem. Quad stays there armed and no commands are sent to it.
Than it unlocks and i can take off and everything normal. I am using joystick and microhard ipmesh to fly from a custom gcs.
It is not something in the latest releases, i noticed this behaviour since long time ago.

Are you arming from the GCS via command, or with sticks ?

Arming with a 2 position security switch, one position arms, the other disarms.