cards tend to have less long term support, than cams or receiver patches, and are more specialised, i.e. only designed to open certain packages.
If you post more information, concerning your receiver, we can recommend whether it would be better to get a Dragon Cam or other solution.
it could be an issue with your receiver, but the packages you mentioned, both on hotbird, are currently available on a funcard, if you have one try that, or you could try different files for your Cams.
Which Manhattan receiver are you using and has it been patched?