This error happened to me a few times. When it happens, IsConnected() returns TRUE, although the expert simply stops working! If you look at the bottom right hand side of MT4, u can see the top triangle is Green but the bottom one is Red. The situation can usually be resolved by manual Login again to same account.

Questions:

1. What does this error mean?

2. How can I detect it via mql4?

3. Can I recover from it via mql4?

4. How can I avoid it?

This is a critical error. I'm surprised there is still no solution to this. All forum posts I have seen around the net of this problem have no solution and no answers. This error makes leaving an MT4 expert alone with no supervision a gamble...

Thanks in advance!