Playing perfectly with latest CPM version (T6A).
Try to update to that version and test. If it doesn´t work and you don´t have connected the device directly to your TV, try that. If it still the same, try to test with another cable, I was having the same problem and changing for a better cable and connecting directly to my Tv fixed the issue.
The cable that came with the Ugoos and my HT-A9 both gave me the problem you´re experiencing with 25p content. Also a certified monoproce cable.
Here´s other user that had the same issue:
I hope you can solve the problem.