Normal behaviour? RAMPS restarting when connected to pronterface

Hi all,

I've got a reprapdiscount RAMPS kit with the smart controller display, on a Prusa i3.

I've noticed that whenever I connect via USB using Pronterface, the motors make a tiny sound, followed by the RAMPS seemingly rebooting - the smart controller display basically goes blank (the backlight remains on) and then comes back on again a second or two later.

Is this normal behaviour? It seems almost like it's resetting or something.

Disconnect / reconnect from Pronterface does a reset if everything is set up according to the defaults. It's the reconnect side that does it.