Is my phone destroying my sd card?
It seems like a very common problem among Android-based smartphones. 
I had a Samsung S3 (or GT-i9300 if you prefer) and it burned six microsd cards...
I tried doing a factory reset (since I had a custom rom) but nothing changed. Thought it was the microsd manufacturer, so I began buying expensive and faster cards but, again, nothing changed. Then I returned the phone to Samsung but they told me nothing was wrong. 
After nine months of memory cards being broken at a speed unknown by human race, I decided to sell the S3 and move to another company (Google and their various Nexus products): I don't have the chance to expand the memory with an external card, but at least I don't have to spend hundreds of dollars to buy new sds xD

BTW the only reason I can think of is that moving an app to the sd requires the phone to continually read data from the card, causing an over-heating situation that damages it...