Thank you for joining the Bose Portable PA Community. I'm sorry you're having intermittent sound interruptions..
How long have you had your L1 system?
Has this been happening in the same location or different locations?
What is the power source (regular power from the wall or is there a generator)?
When the sound drops out, does it return by itself after a few seconds or do you have to do something like cycle the power off/on again to get the sound to come back?
The two most common causes of sound drop outs are poor AC power and an issue with the connection to the bass module. The cable should be connected with a twist and you'll feel a click when it's locked into place.
Please give the answers above and we'll work through this.