When selecting text the cursor jumps in a weird way

I don't know exactly how to describe my problem.

I have started gvim and loaded a file.

The cursor goes to line 215 and the last visible lines in the gvim
window are line numbers 215 and 216.

Now I type V, and go down to select lines of text.

Very quickly, the buffer gets redisplayed in a way that now lines 219
and 220 are at the beginning of the gvim window which is weird as lines
215-218 are no longer visible. This is very irritating.

Is there anything I can do to prevent this?

--
Manfred

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