In case this is affecting anyone…
If your account is set up to use smartthings widgets on either an iPad or an Apple Watch, you need to remove the widgets before you uninstall the old app before you install the new app.
I think the widgets may be causing some of the crashes.
From the dashboard, tap the three vertical dots in the upper right. Choose “my account”
Now choose “manage watch and widgets” to turn off all widgets. Tap done in the upper right to save the changes.
Separately, if you also have the app on your watch, you need to go into the Apple Watch management app and uninstall smartthings there.
Then you can delete the smartthings mobile app and install the new version.
Remember to Add back the widgets that you want, and then reinstall it to your watch.