This because you are maybe using QWERTY or AZERTY. Try Dvorak instead
I had the same problem with a typing tutor I was using. I would sometimes mi**** Esc instead of 1 and that would cancel the lesson. It was a massive inconvenience. I'm using Colemak, btw. I don't think that it matters what the layout is, as long as Esc is not remapped, which is probably not the case with a standard Dvorak layout.
Also, no offense, but spending months learning a whole different layout just to avoid that issue is a ridiculous suggestion.
I like the HHKB, it's a good concept. But, I don't think I'd get another one because of that and some other layout issues. If it were fully programmable I would definitely change my mind. Oh, for a Miniguru!