Always worth trying an app cache clear (not data, and certainly not the partition unless really pushed). Cache clearing is pretty harmless but there's a faint chance it will help.
Instructions for cache clearing on a K8 here; the app in question is probably the "messages" app.
cellphoneforums.net/lg/t403069-lg-k8-clear-app-cache-data%3B-reboot-safe-mode%3B-wipe-cache-partition.html
Own risk etc.
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