Corruption. As you know, not a good thing to have in your colony, you have to stop corrutpion to gain support from your people.
Corruption rate increases upon time after independence, some factors such as population, low approvel rating and serious poverty may further increase corrpution rate.
Government Reform action can cut down corruption for a while, costing civics and money. But you still have to keep an eye on corruption, as if it is too high, riots break out and nobody will work for you.
Independent Corruption Investigation Agency can greatly decrease corruption rate, reducing the need for reforms.