The 'e' key stops working at seeming random times.

Several times now I've come to the computer to wake it up, and can't login to my account apparently because the 'e' key is not recognized when I try to type in the password. It does not seem to be a keyboard issue, because when I plug in a different one, it still has the same issue. When this happens, I have to turn off the compter by holding down the power button on the back. Of course this means I've lost anything that wasn't saved. After the computer boots up, it appears to work fine afterwards. Intervals between this problem have gone from once every couple weeks, to once every couple of days. It appears to be only the 'e' that is affected.
Any ideas?

The problem seems to be related to an alternate keyboard layout I sometimes use for writing in Esperanto. It appears that if the computer goes to sleep when this layout is active, the password requester won't recognize either the 'e' or the 'a' keys. This is rather strange, since this layout doesn't redefine either of these keys.
The work-around is that I've changed my password so that it doesn't use either of these keys. One I'm properly logged in, the keyboard works normally.
The particular layout I use is an old one, with the last update on the readme file dated 2004. I haven't been able to find a newer version of this layout, and other Esperanto layouts I've found remap the keyboard differently from this one. It'd be like learning to type all over again. I don't want to do that if I can avoid it.
I appreciate the help and advice. I knew that just turning off the power was a bad idea, but I didn't know what else to do, if I was unable to log in in the first place.

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The 'e' key stops working at seeming random times.

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