Hoping he’s continuing to do well. Honestly, I don’t believe in luck, but some people just seem to have a run of unpleasant things happening to them, it does stop though. I used to work with a girl who always had the most stressful things happen, it was a saying in the office, It could only happen to “Sarah”. In the space of a week she accidentally (of course) reversed over her cat (cat was fine in the end), found a dead body at the side of the road (a homeless man who died of alcohol abuse) and fell down her stairs and broke her hip (aged 22!). In all seriousness though, Asothers have said, all the rabbits that have come to you recently have come from less than ideal conditions and so there is bound to be a higher incidence of problems. Add into that mix the fact that sometimes, there is no cause, it’s just one of those things, such as when I lost Flip when he was neutered, whilst his littermate Flop was absolutely fine.
In summary, it’s nothing that you have control of, you haven’t done anything wrong xxx