Samsung Galaxy Note20 app keeps crashing, freezing or will not open

The checks in more detail

A cache partition wipe after the last update clears leftovers. If one app crashes and others do not, it may need a newer version than the phone supports; check the app's minimum Android version in the store, and look for an older version that suits. Uninstall apps you do not use. Samsung's Sleeping apps list can also stop apps from running, so remove the crashing app from it. If everything crashes, back up and consider a factory reset, remembering that the phone's support has ended and a replacement may be a better investment.

Samsung's own Members app lists the phone's error reports, and the Settings, Digital Wellbeing screen shows which apps you use most, which identifies the app that crashes because it is the one you open often. Keep a list of crashing apps and check each one's reviews for the Note20 or older phones, because other owners may have found a version that works. Another cause on a phone this old is a nearly full internal storage and a small amount of free memory, so the phone's Device care Memory tool can help you see how much is free and clear background apps.

If you keep many apps installed for rare use, removing them lowers the phone's background load, and a lighter set of apps makes the phone more stable. If a banking or payment app crashes, check its requirements: such apps often stop supporting phones without current security patches, and the Note20's patches have ended, so the app may refuse to run for security reasons. Contact the app's support, and consider using the bank's website in the browser as an alternative until you can replace the phone.