I am using Ranorex 3.0.0.1 licensed version.I have been using this to automate my UI which is a winforms application. When i run my testcases individually,i am getting the expected results.But when i combine more testcases, ranorex becomes inconsistent and gives me different results at different time. This is really annoying.

I am running the test scripts through visual studio by including ranorex dlls. By the term inconsistent, i mean, sometimes its setting the combo box value correctly and sometimes not. And sometimes clicks a control and sometimes not and so on. Am not getting any error messages though. When i run the same set of test scripts under same environment,i get the probability of test cases being executed correctly is less than 50 %

Can you help me regarding this?
Regards,
Siva R S