What were the main reasons for popular uprisings in the first quarter of the 17th century?

Most of the first quarter of the 17th century fell on the Time of Troubles and famine under Boris Godunov, so the uprisings had the following reasons:

Famine of 1602. He led to the uprising of Khlopko Kosolap, fugitive slaves who were not fed by the owners took part in it.
Strengthening serfdom, for example, increasing the term of exile of fugitive peasants, they became participants in the Bolotnikov uprising in 1606.
Power crisis and imposture. The most unusual and serious reason for the uprising, not every country at that time had impostors. The overthrow of False Dmitry I in 1606 led to the uprising of Ivan Bolotnikov, who even laid siege to Moscow.