Vierd Slimline Tube Problem

Just got the Resmed Airsense 10 unit recently, it comes with the Slimeline Tube.
Used it and the next day, found the tube became longer, sorry can't post picture here. There is a segment in the middle has the plastic gap "pulled" wider and the plastic became the thin film. With this happened, I could the feel the pressure was lower and the unit won't stop if I remove the mask.
This is the second time it happened. The first time the dealer replaced a tube for me. Now just used the second new tube for one night, it happened again.
Has anyone met this problem? What could cause this problem? I just start using the CPAP machine, I really appreciate any experienced user could give some clues.

JackToCa wrote:What could cause this problem?

The hose was stretched too far. Do you suspect something different?

Ask for another replacement.