V4 - Exposed pads IC5 and IC17 (TPS51200DRCT) not connected
There are four exposed pads that are there for thermal reasons, that are not foreseen to be soldered in V4. They actually should be soldered, which would need a revision of the board.
As the design has been fully functional, this change has no priority and should only be made when other PCB changes are needed.
How it should be (2 additional pads on left and right of IC17