PMDG 777 making circles around itself and not following route

This problem started on my first long range flight, the plane was so normal in cruize and suddenly it made a left turn and kept turning around itself, I checked fmc for any discontinuety, checked recall and overhead, everything was normal, and after that, the master warning came out with (pilot response) warning on ECAM written twice with red and yellow. this happend also before the turn twice and I resetted them but they kept coming up.

Karim.