Router motor turns off

I bought the Bosch 1617 router kit a month ago and I started having a problem with the motor slowly turning off. It first happened after the router had been running for about 10 minutes and the motor just slowly turned off. I let it sit overnight and when I used it the next day, it did the same thing. Now it will turn on, but within 15 seconds it will slowly power off.

Does this sound like the brushes? It is under warranty and I’m trying to decide if I should go through that process (which I assume means no router for a while) or pop it open and start diagnosing.

I really like this router and was planning on getting a second one to keep in the router table. I really want to finish the project I’m working on and am considering running up to Lowes and getting the regular base model. Am I throwing good money after bad, though? Or did I just get a lemon? I don’t think I did anything operating the router that would cause this. I’ve used it a lot over the last month making plunge mortises and in a router sled to flatten a top, but I’ve never taken more than 1/8” inch material at a time.