Welcome to the forums!
Since your phone is acting squirrely anyway you might as well perform a Factory Reset and get a fresh start. You should also boot into Recovery mode and clear the system cache.
As far as your missing SMS - sorry, no way to get that back that I'm aware of.
Sent from my rooted, debloated, deodexed Sinclair ZX-80 running CM -0.001 using Tapatalk