chronic 4gb memory card issue

[esqueue]

I have real sandisk 4gb card that every so often, fails to get recognized by my phone. Odd thing about that is that my computer can read it through the phone via disk drive mode. The card works great on everyting but the phone.

The only remedy to this is to copy all data to my computer, format the card and copy the info back.

Is this what I hear some called getting the card corrupted? I had 5 ringtones on the card which I removed last night. Is that the cause of the issues that I am having?