This same thing happened to me. I booked through Frontier so when they changed the times I got a call from them asking if it was ok. They had good customer service. At the time things seemed ok but now i see on the way home instead of a 2 hour connection time I only have 45 minutes which is really only like 20 and I have tracked the flight and it seems to be delayed a lot so now I am worried. I think I should give them a call too. After reading up on the connection policies it seems like they will just book me on the next available flight but I might still need to pay fees and wait until the next day if that happens. Seems like they should do something more than that since they shortened the time frames. Let me know if you find anything else and I will do the same.