There are numerous pre-loaded, and a few downloaded, apps on my S5 using a lot of internal memory. I've tried to move them to the SD card but when I select the App the "Move to SD Card" option is greyed out and not active. As a result, internal memory is down to less than 10% of the total available. Also, those that could be moved do not work after they are moved.
How do I solve these problems?