Secret nerfs in bug fix patches?

OrphanHelgen

I have read, and experienced myself that the survey maps for enchanting writs are more rare. Haven't actually got one for about a week. I also used to do a daedra heart and motif run in Reaper's March, but the same day as an small bug fix patch, I couldn't find any sign for daedra hearts at all after running the same rout 5-10 times. Before I always got 2-3 deadra hearts in one run.

Am I being paranoid, or is it normal to make changes like this without informing? I can understand this if they want the motifs to become more rare, and changing the drop locations or something.

When this is said, the only writ I do now, is alchemy.