vi or curses loses '[' character when arrow key overused

[Tom Friedel]

Running vi, with terminfo entries

	kcub1=\E[D, kcud1=\E[B, kcuf1=\E[C, kcuu1=\E[A,

If I hold the left arrow key down, the ESC-[-D sequence seems
to occasionally lose the '[' and causes vi to go into insert
mode delete the rest of line.

I am wondering where this error happens.  It is more pronounced
in the X11 windowing environment, presumably because of slower screen
updates

This is on 386/ix 2.0.2.

tom