Could this be the reason TRACE ADKINS fell off the wagon back in January?

Trace's wife Rhonda filed for divorce on Tuesday, citing irreconcilable differences. They've been married 16 years.

She's asking for custody of their three kids, who are 16, 12 and nine along with child support, alimony and legal fees . . . and according to TMZ, she wants to be named the sole beneficiary of his life insurance policy.

It's been a tough year for Trace.  In addition to the drinking, fighting, rehab and divorce, he also lost his father last month.

Photo by Slaven Vlasic/Getty Images