My speculation is that it's a combination of a league wide offensive drought, a lot of our guys randomly having slow starts and a tough early season schedule (I saw a graphic where the average fastball we are facing is something like 95+ and the average fastball the Yankees have been getting is 91 or something). You could probably throw in bad BABIP and bad sequencing when it comes to getting a hit with RISP.
Add it all up and you've got a bad offense. But it doesn't end there either. It's all being compounded by the fact that the players are now pressing, perhaps moreso with RISP.