Question: Maple 17 freezes

For executing a worksheet in Maple 17, I use the shortcut sequence Alt E + E + W. Once in a while I mistype this sequence, and sometimes, when doing so, it causes the worksheet to hang or freeze. Then it seems possible to terminate Maple only by killing it in the Windows Job List (Ctrl + Alt + Delete), where, by the way, the program still figures as running.

Until now I have not been able to track down what exact (wrong) key sequence of mine it is that triggers this unfortunate behaviour. Although weird if actually so, perhaps it also depends on the present state/history of the actual worksheet, I cannot tell for sure. Talking against that, though, is the fact that the behaviour has been found in different worksheets of mine, also very simple ones.

Has anyone had similar experiences with Maple hanging or freezing this way?