Your ideas!
1. Insufficient Resources
-A. Problems acquiring natural resources, either from scarcity or lack of technology to obtain them, or permission to use or inability to protect them.
-A2. Deflation or Inflation. Either it is becoming too expensive to obtain demanded resources or the value of a very available and heavily invested resource has suddenly plummeted and companies must cut costs with layoffs, making valuable items harder to afford driving their cost down even further.
2. Humanitarian Problems
-A. Large groups are unsatisfied with the status quo or a recent or chain of recent decisions and an uprising has begun. National assets are threatened by violent protests. You're in danger of being removed from your position by your own people. Impeached!
-A2. The issue could be the way resources are distributed, but changing it could reset your nation's economic engine and the recovery slow if worthwhile at all.
3. Foreign Confrontations
-A. Hostile "barbarians" or an aggressive nation or organization nearby invading your lands because they believe confronting or defeating you will benefit them.
-B. You have a deal with another nation that doesn't serve you and you believe they may even have a false claim or are abusing the contract. The terms for canceling are just as bad if not worse.
-C. "Pirates" are feeding off your sea trade routes and causing fear and panic.
4. Plague
-A. Either poor living conditions, bio warfare, or other or unknown sources has caused a disease that is spreading among a nation and may spread to another if uncontained. Could be lethal, crippling, or otherwise greatly reduce quality of life temporarily or permanently until cured.
-B. The victim could be a living resource, crops or herds.
5. Weather Disaster
-A. A large scale weather event such as a tornado or hurricane has decimated all homes, factories, and land, air, or sea transports in it's path.
-B. A drought can cause many kinds of resources to be negatively affected and invite unrest and panic.
-C. Human pollution or resource stripping have weakened the Earth's natural systems making it's natural cycles of hot and cold periods more extreme. Causes other weather disasters to appear more frequently. May only be lessened by utilizing rare and valuable resources that to do so could be acutely costly in the short run, and require largescale international cooperation.
6. Nature Human Rejection
Plants have started to appear that are actively lethal to humans. Populations decline, panic, and widespread migration from such zones.
7. Civil Confrontation
Groups from within your own nation have a negative agenda or one that opposes your own.
-A. Religious Extremists have demands you devout yourself to their way and require others to do so, agreeing to it will in itself cause an uprising and disagreeing could lead to terrorist intimidation.
-B. A terrorist attack of an extremist group that has grown from within your own nation. A key place or event could be the target. Could have consequences on another nation's trust of you, especially if the group targets them also.
8. Breakaway Group
A territory of your nation's land wishes to become separate, if you agree you will permanently lose resources in that area unless you take them back forcefully or via bargaining. If you do not agree they will get angry.
9. Geological Disaster
Earthquakes and volcanoes can disrupt or destroy resource flow, cause panic and migration(nationally or internationally).
10. Rights Dispute
A sea based resource lies untapped and undiscovered until just now, and the discovery belongs to one nation but the resource lies clearly closer to another, who gets it?
Some of these can be broken down into multiple smaller crisises or have variations. Combined with my own fun bag of tricks this should be a treat to solve.
We're well on our way to starting properly.