I wrote two novels as a novice, and I'm on the third right now. As I began writing it, I noticed my stories tend to revolve around two things (my genre being sci-fi):
An AI. Not the typical evil AI you'd see, not even a consistent type of AI (it can be all-powerful or quite mediocre, sentient or not), but there's always an AI lurking somewhere.
Death. Because it is a very complex and interesting subject, I like to tell about it in my stories.
Is it an issue? I fear that eventually, people that read my work will start being bothered by the fact these two points often come back. Is that actually the case? Is it bad to focus on very specific topics?