I noticed when sending from the wallet you need to unlock it first by typing the pass and after sent you need to lock it again. With the regular qt it asks you to type the password before sending so no need to unlock and lock again.
Thanks for raising this. The wallet is based on slightingly older QT code which does not have 'automatic unlock/relock' functionality.
I opened issue/enhancement request for this on our github - it will be dealt with.