This is my reputation page links: https://math.stackexchange.com/users/93616/sawarnik?tab=reputation .Click under today, and you will know why. These question are not bad and inactive, and I do not understand why they are being serially down voted now?
No, serial downvoting does not mean your answers are bad. As noted, serial downvotes (if that is what these are) will be reversed automatically once a day.
But three downvotes is nothing: a week ago I had 20 of my answers downvoted within a period of 7 minutes. The lost reputation was restored automatically by the next morning.