When reheating any kind of rice, you will need to add water to it (with white rice, just covering the container with a damp paper towel works). However, brown rice does not reheat well at all; and from personal experience it is exactly how you describe it. So what we do when we cook rice for our meals, is we throw it in the rice cooker as we shower and get ...
The main reason for rinsing, and indeed soaking, rice is not starch, but arsenic. Surprising people are unaware of this.
'Arsenic In Rice: How Concerned Should You Be?':