angular2/upgrade has a bug that occurs when an angular1 watcher calls setTimeout, as is the case with many angular1 components.

Repro: http://plnkr.co/edit/5iCEQOSOer5c630FStXv?p=preview

This results in infinite angular1 digests because of this line:

https://github.com/angular/angular/blob/master/modules/angular2/src/upgrade/upgrade_adapter.ts#L341

Changing ngZone.run to ngZone.runOutsideAngular there seems to fix it or make it more manageable.