Exactly what did happen: such a huge territory and the accompanying long borders, especially with a comparatively small army, meant they couldn't control everytihng at once. As soon as concurrent uprising and invasion began, there wasn't any ability to repel all invaders and still maintain the territorial control. Basically, it got too big to manage.
A problem the song dynsty faced was not having enough soilders to control their empire.
The Austrio-Hungarian Empire faced the problem of war.
The flooding in of Eurasian peoples.
The problem they faced were nationalist revolts break out and Young Turks demanding a reform.
The Austro-Hungarian Empire faced many problems. One of which was the pure size of the Empire. Another problem was its defeat in World War I.
He faced problems with the civilions, because they wern't thrilled about having a french man on the throne.
Hey Susan I know you love raisins but you are a big nerd
As Germany's empire expanded throughout the world, they ran into financial struggles which made their takeover more difficult.
Charles V faced political problems, religious problems, and unity problems.
The problem they faced were nationalist revolts break out and Young Turks demanding a reform.
He was so busy having sex with his wife he couldn't concentrate
After his ten-year conquest he died/was murdered, so he had little time to deal with the problems to trying to unify, rule, expand prosperity and culture which faced him.