Mining ship reverses out of sight!

[Halfton]

I have a dedicated mining ship.  Often, when I give it the mining order it will for some reason engage reverse and boost backwards at max. speed.  It will do this until I realise what has happened and give it the "Escort Me" order, at which time it will come to a halt and start approaching me again.  If I then give it the "Mine" order again it will, most of the time, start mining normally.  I have noticed this now several times in a 2 or 3-hour mining spree.