I keep getting these messages about backtraces?

[mi] These backtraces from mieqEnqueue may point to a culprit higher up the stack.
[mi] mieg is *not* the cause. It is a victim.
[mi] EQ processing has resumed after 37 dropped events.
[mi] EQ overflowing. Additional events will be discarded until existing events are processed.
[mi] This may be caused by a misbehaving driver moopolizing the server's resources.
xinit: connection to X server lost.

Anybody ever seen something like that before?