I was unfortunate enough to lose my ship there last night. There was no warning of any kind, just a couple of Anacondas lurking near the entrance. Then, a long way from the slot, and out of nowhere, a ship suddenly flashes up on the radar just next to me, and within the space of literally 2 seconds, I'm looking at the buy-back screen. No idea at all what happened, and rather impressive to see how quickly an A-rated FAS with mirror armour, and four pips to shields is vaporized by the station!
So, I re-spawn a couple of systems away and head back, taking a good look from a distance. Again, there are a couple of Anacondas, but also (very occasionally) a sidewinder appears on the radar. Checking the forums, I found this thread and realise what's happening, so decide to head in to dock at a low speed. A sidewinder (20% hull) is now lurking in the dock, and keeps hitting me, but not enough to cause him to explode.
Decided to head out again and, just after the slot, the sidewinder hits me and I have the satisfaction of seeing him explode.
The comments about keeping to the speed limit and watching out for other ships are all very well, but this sidewinder is extremely stealthy (silent-running at least). I also didn't see him approaching either time, so I'm assuming a collision from the side or behind. Also, while I tend to agree about keeping to the speed limit through the slot, it's very tedious to have to keep to a low limit on all of the approach, just to avoid being hit by a stealthed sidewinder!