Need help with buffering issue

Hi guys,

I recently inherited an ugly VI that I am just now becoming familiar with. The tests I am trying to run are approximately 25 minutes long, but I keep getting a check buffer issue "error 70137". I cannot figure out how to fix this problem, nor do I know exactly what it means. Could anybody offer some guidance?

In the attached VI, im running 1 cycle @ 6 percent strain, with a relaxation period of 20 minutes, and then 10 oscillation cycles at varying frequencies.

Thanks!