Sorry I can't recommend a specific remedy, but a couple of days ago mine (after running flawlessly for about 150') started omitting the glue for the first 3 to 6 inches. I run mine with the glue volume turned down about 6 to 8 clicks from the center (default) position. I raised the volume 2 clicks and it started working perfectly again. Then I lowered the volume back to where I always run it and it worked perfectly for the rest of the job.