What about getting a song stuck in your head or having a nervous tic? I'm not sure the concept of an infinite loop even makes sense for a brain's "architecture

What about getting a song stuck in your head or having a nervous tic? I'm not sure the concept of an infinite loop even makes sense for a brain's "architecture" anyway. After millions of years of evolution, there are lots of "errors" that just aren't common at all, so asking why an error isn't "normal" is very presumptive.