Issues after updating to Jelly Bean - S3 Telus

After updating to Jelly Bean 4.1.4 since Telus made the update available, I have been experiencing issues with the phone.

Not able to access "Language and Input" in Settings. Every time I click it, phone freezes for a moment then sends me back to home screen with message "Settings has stopped working". Can someone tell me if I should just factory reset then try updating to Jelly bean again? Or is there a reason for this issue (and possibly a fix)?

My phone has been on 4G for the longest time now. I have not seen LTE even once after Jelly Bean. Same issue for anyone?

Also, anyone know about Wechat app for Android? After the update, the voice messaging does not work anymore. I reinstalled but still not fix. Any suggestions?

Thanks,