Ann: Change of Director's Interest Notice , page-22

Simple answer - They are suffering growing pains from growing too fast too quickly.
They need to consolidate for a period (which David Stewart has already flagged) and then continue growth (probably in 3 years time IMO. Sure the sectors of resource and infrastructure repairs are on fire but LEI execution / capacity has question marks till sorted out.

I don't see any return to stellar performance in the next 3 years.

Sorry but no reason to hold on....
Could go to $17 (and not a bad buy at that price)
Better prospects with other companies in the short term