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Here's a link to the VX5 manual...
https://cdnp.leupold.com/products/productDownloads/vx-5_hd_riflescopemanual_18x12.pdf?mtime=20170727093043

From the manual...so the work around is to actually turn off the illumination while driving to your hunting area.

3. To deactivate the illumination, press and hold the button for at least 3...

I sold my VX5 about 3 years ago, but if I remember correctly when the firedot is turned off it stays off, but if not turned off it comes on again with movement.