As below e-mail from KhunNatthapoom of which this is seem to be a typical problem that some FOTON customer had been facing.
In order to gain back customer confidence - may I propose an additional support to immediately visiting this customer that should including FOTON team, After Sales Team and TCZL team etc. for offering a fully vehicle check up with the particular unit that having problem or even to all 5 units.
Kindly confirm which date should be your most convenience during Apr. 08-10, 2015.
Thanks and kind regards,
Prakrit H.