I doubt it really "lost" 15 seconds. The timekeeper likely accidentally reset it to 25 seconds after setting it to 40. You see mistakes with the playclock like this often. Teams complain, the ref stops the clock and tells them to reset it to 25 seconds, the game goes on.
But if it was a malfunction, then a few times every year you'll see the refs announce they're stopping using the playclock because it isn't working properly. Again, the key there is that someone has to see the error, and if the refs don't, the coaches could've immediately pointed out it was at 25 instead of 40.
The key part of that we didn't see last night was neither the refs nor the moronic team in blue noticed it was reset to 25. But, similarly, just like they do things like ice their own kicker, botch when to use timeouts, and run the ball 7 times when the opponent can't stop the run, coaching at the NFL level is way over the heads of our coaching staff. A clock conscious team like say, the way Indy used to be, would've pointed it out to the refs immediately.
