sell in may

I have re-read the announcements and listened to the BRR media reports again and still believe the company has a lot of potential in the not too distant future. Yet on a regular basis we have a late sell off. Are investors concerned TT won't pay the balance by 30th June, that the company won't be able to fund the project,that Morocco is not stable enough , that the company will dilute value by a share issue ??? All comments would be appreciated.