Wow, tough group and a lot of interesting fixes. I have the same 32gb SanDisk SD card in my s5 that was in my s4 and s3 before that, I have never had read issues or had to reformat. It's filled with music and pics, and it doesn't take days for your phone to scan your SD card, that was funny. Op - factory reset is in order, you could have got a bad one. I have everything syncing, Google +, multiple emails, and have no drain. I do not back up pics to Google + though. I am also averaging 30 hours of usage all on LTE with over 3 hours of on screen time.
Posted via Android Central App on my S5