Yes, I've cleaned the contacts and the magnet is firmly in place.
I've tried a 4GB card and that works fine. I wonder if perhaps class 2 is too slow?

The dmesg suggests timeout errors:


[83775.788574] mmcblk1: error -110 sending status comand<3>mmcblk1: error -110 sending read/write command, response 0x0, card status 0x0
[83775.788635] mmcblk1: error -110 transferring data, sector 10403861, nr 3, card status 0x0
[83775.788635] end_request: I/O error, dev mmcblk1, sector 10403861


It's a bit of a nonsense.