New Samsung S6 tablet stuck on Samsung logo?

Since 5 of the Samsung tablets you received are working differently than the other 15 tablets, it's clear that either:

1. Samsung has sold you a bunch of defective tablets.


2. You received at least some counterfeit tablets.

In the comments, you mentioned that you believe you purchased them from a reliable source. If they are genuine, your experience indicates Samsung has a quality control issue... perhaps a serious one.

Return the tablets for replacements or insist on a full refund.

Note that I've purchased multiple Samsung Android products with serious problems, and trying to get support from Samsung was time consuming and a huge hassle. I now try to avoid Android devices made by Samsung.