Lg Android "authentication failed" notification all day & night

[AC Question]

How do I get the "authentication failed" notice to stop? It has been doing it since I got this AT&T LG android phone 2 years ago. I contacted AT&T shortly after it started and they just said it was a computer glitch with no solution. Thank you

 

[B. Diddy]

Welcome to Android Central! Wow, it's been going on for 2 full years? Which phone is it, and what version of Android is it running? When does this message appear? Are you able to use all of the Google apps without difficulty?