First post on here, love the Forum BTW
Take it back to the dealer to get it checked... it's as unpredictable as an unpredictable thing i.e. pants
I've had my 66 plate Dynamique S since (March 17) and it should be booked in this week for the left rear brake calliper to be replaced under warranty ..... the right side rear was replaced under warranty in November 2017.
All because the Electronic Handbrake/ Parking brake goes 'dick' every so often.
Give me a proper one any day... I am ok to manually work it, honest.