Hamster strange noises! Is he sick? What is happening?

Hy everyone,
I have a problem with my little hamster…he has 1 year….recently i’ve changed his cage with a bigger one..with tubes and playground…after a few days, hamster makes strange noises….when he is in the house the sounds are he choke….when is out of the cage and running/playing he’s acting normal…no sounds….
I’ve filmed him today…the sound is not so good, but if you listen carefully you’ll hear the sounds…..is not a respiratory problem…the nose it’s ok….it’s normal to do like that?
Can somebody help me? Someone had the same problem?

source: Youtube