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you can't put apps on it if it is not rooted and some special software downloaded. Apps otherwise have to stay on the internal memory. Only pics, vids etc can go on the sd card.

Not true. S4 and note3 stock rom allow apps to be moved to sd card
 
Not true. S4 and note3 stock rom allow apps to be moved to sd card

Oh ok, I havent used this years phones but all of the older ones were you couldnt. I wasnt aware they changed this. Thats good news.
 
Mine only got ridiculously hot when charging it and doing something labour-intensive (wifi syncing with iSyncr for 4 hours).
 
Keep backup and reset your phone totally.reinsert the memory card.I think you will get good feedback.
 
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