SmartFade Ml Memory Record Issues

Our SmartFade ML will not record a memory from A or B I can record a memory from another Mem. also going from the mem. section were we use channels 1-48 as cues for a scene I sometimes go back to individual channels in A&B but as I hit a bump button to a channel it is not active only if I slide the cross fader up & down then it will activate, during a show this becomes difficult both issues started at the same time. We use prests for house lighting and also use the led section saved to mem cues for various devices.