Hi I don't know if there are other operators that has freewheel problems. Our relatively young fleet has had three such problems...two of which was felt and reported by me
A third one experienced a flameout due to the slippage. All the three cases are from the No 2 engine.
In the previous two cases I felt a pronunced increase in the yaw when No 2 eng is engaged ( No 1 eng in flight) . It is really difficult to tell how much is too much and always leads to some debate with the engineers!