Did you try the second step? Shut down the scanner completely, flip the radio over, open the battery compartment,
remove the right side batteries. Press your finger against the memory card, and it pops out a bit. Remove the card for 1 minute, and reinsert it again until it stays in. Replace the batteries, and power up the scanner again. Let me know how that works.
If it doesn't, you may have a corrupt card(?) or something Uniden will have to suggest. DUKE, WB9OJD. You can private message me if you need to: