I just got downvoted on 10 answers on this site with no comment added to any of them. I assume it's not a mere coincidence. Possible reasons as far as I can tell:
- Something happened to a user who had upvoted me on all those questions.
- Someone decided they don't like me and just downvoted a bunch of my answer.
It's probably not 1., since I haven't seen a "user removed" notice. If it's 2. - what do I do? And if it isn't - are there other possible causes?