This is beyond annoying. It can be fatal when mining in a slow ship if your game crashes when you are in the middle of the ring and have some mined cargo in your hold.
Also, running away doesn't always work. I was once chased for 20 minutes by an Anaconda that I had earlier avioded in supercruise by slamming him into another part of the ring. I'd run for several minutes, my Orca boosts at 500 so I can run quite a distance. But the Conda kept turning up again. I gave up eventually and went back to the station.
The Conda followed me there too. I wrote a thread about this a while back:
Look what I mined!