Galaxy S3 Cannot Use SD card

For a week or so my Galaxy S3 use, see or format the SD-card. Tried restart, taking SD out etc. but nothing worked. Empty slots for notworking programs are all over the phone. Could not remove the non-existing apps - which is messy and weird.

Log ...

• Software update - did not help.
• Reset to factory settings - 

One week later

So far no progress. By now I just use the phone for talk and sms. So not-smartphone. Trying another update.

Found this - it seems that the SanDisk app is the cause of the problem.