I think this is mainly because AJA is no longer counted in ASX 200 index.
If the share is a part of the index, there is much more activity as the index funds have to buy or sell these shares in order to maintain their portofolio balances.
Every time they receive contributions they have to distribute proportionaly accros all the shares in the index. Similarily, when there are withdrawals from those funds, they sell the shares in the index.
Since AJA was removed from ASX 200 index, index funds do not hold or trade in AJA units.
AJA Price at posting:
$3.85 Sentiment: Hold Disclosure: Held