My touch and network+ app is crashing in Lumia 620 after updating to WP 8.1. Any suggestions how can it be fixed?
If the apps are all up to date your only option is to do a hard reset as you can't uninstall / reinstall those apps manually. A hard reset usually fixes all issues caused by the WP8.1 update.
Go and download sysapp pusher and install the feature from there. That might fix it.