The universe is awash with strange radio signals, but astronomers have now detected a really bizarre one that repeats every hour, cycling through three different states. While they have some ideas about its origin it can’t be explained by our current understanding of physics.
Personally I think the more complex pattern of having 3 different states being cycled through once an hour is significantly less likely to be natural.
That, of course, doesn’t mean much by itself; it still is possible that it is natural and we just don’t understand why. More research into how and why that is happening is absolutely required to answer the question. I just don’t know if we will do it, or if we have the tech needed to fully investigate it yet.