Bambu A1 less than 2 months old. PETG. A couple of times while printing i will hear a thunk from the bed, like it hit something. The bed moves to the far rear position, the print head moves to the poop station, waits about a second, and then resumes printing as if nothing had happened. No misalignment.
This sounds real bad, but maybe it’s normal … ?
You might want to record a short video of it. It’s really difficult for anyone to get a clear sense of the noise from text alone, or even from photos. You’ll probably end up needing a video anyway, especially if you decide to reach out to support since you’re still under warranty.