That is what I am afraid of with only 900 miles in it. I'll check it when I get homeYou might try rocking your seat to make sure it's firmly in place. One of the reasons I got rid of my last ride is that the seat track came loose from the floor, allowing the seat to rock. I didn't think I'd find anyone who would weld the nut back into the floor on such a safety-critical part.
In your case, it would be covered by warranty. At the time, I was like 15 years out of warranty.That is what I am afraid of with only 900 miles in it. I'll check it when I get home