According to this article on TOI, and of course by seeing some people in some groups on Facebook complain about these things, Israel Post has been unable to handle the massive increase in packages arriving for delivery in Israel from Amazon shoppers.

Personally I have had no problems with any of the delivery methods and have gotten whatever I have ordered in a pretty timely fashion, sometimes even surprisingly fast, but one cannot say this was not predictable. Israel Post has had a bad reputation for a long time, and increasing their workload was not going to improve the situation.

While it was probably expected and predicted by just about every Israeli who might have ever used Israel Post, I did put it down in writing over 3 months ago when Amazon first announced it was going to be using Israel Post to handle much of the workload...