If you are setting the com port manually then try the following patch file.
Here are the steps to apply patch:
1. Download the attached files and put them in the same folder.
2. Navigate to the folder created in step 1 above in MATLAB.
3. Run the 'applyPatch.m' file from MATLAB command prompt.
4. Restart MATLAB.
Hope this helps!
Please let me know if this solved your problem.