Companies having a problem holding on to good employees might want to consider those employees are burning out.

That's according to a study from Kronos Incorporated and Future Workplace, which says burnout is the biggest threat to building an engaged workforce in 2017. The study, the most recent in the Employee Engagement Series, finds 95 percent of human resource executives not only chalk up the problem with employee retention to burnout, but don't believe a solution will be found in the near future.

While 87 percent of respondents say increasing retention was a crucial priority, they also cite plenty of obstacles to resolve the problem. Close to half (46 percent) say burnout was responsible for 20 percent to 50 percent of the turnover in their organizations, and close to 10 percent say it causes more than 50 percent of workforce turnover each year.