The phrase "gap problem" refers to a situation where there is a difference or missing information between two things or points. It means that there is a gap or a problem in understanding or connecting the two. Full definition
This approach deals directly with the transmission gap problem, well - documented in the literature. (iaia.ie)
Facing this skills gap problem head - on, college students may find better jobs and employers may find better workers all while improving the higher education system. (jamesgmartin.center)
They are very, very stretchy, which is comfortable, although not always the most flattering on me, but it did eliminate the dreaded waist gap problem. (elle.com)