I was able to find a solution that works.
- Turn off your Wi-Fi and keep it off or the box “LG IMS has stopped” will pop back up. Simply repeat the steps below to remove it again.
- You can navigate the phone with the message “LG IMS has stopped” just click any space on your phone screen around the box.. It will reappear in about three seconds so you will go a bit slower until you complete the steps below.
Steps to clear LG IMS has stopped box
Go to settings> storage//internal storage>other apps>hit three dots in upper right hand corner...>show system>scroll to find, com.lge.ims.rcsprovider (was not in order on my phone)>clear data/cache.
The box will disappear.