Bubble magus skimmer trouble- help!!

[jtf74]

The motor is running but not getting the bubbles. I unplug and plug in and it skims again and works for a day maybe. Nothing is clogged in the airline and the motor didn't look gunked up at all when I first noticed a couple weeks ago. Any ideas on what the trouble may be? It's been running for almost 2 years.

 

[lapin]

Duplicate post:
https://www.reef2reef.com/threads/bubble-magus-trouble-help.845888/