A new survey of hundreds of United States companies shows that 51% of workers experienced at least one mobile device issue a month that hindered their ability to do their job & and the number of such problems is increasing.The second annual State of Enterprise Mobility Surveyfound that mobile device failures can have financial impacts on companies, including lost productivity and workers calling in sick because of job stress & particularly for companies that use thousands of mobile devices in the field.[ Related: Android Upgrade Report Card: Grading manufacturers on Pie ]More than one-third (37%) of those surveyed experienced an increase in mobile device issues during the past 12 to 18 months; the most common failures involved unreliable network connections (45%); battery failure (41%); and apps that crash or become unstable (40%).