I got my new S7. I have no more SD card notifications at all. Not even when I reboot the phone. Yesterday (again) I was listening to music (a set of 2 hours long) from my SD card. I started to look at pictures (again) at the same time. After 40 mins or so, my phone stopped the music and stopped being able to read my SD. Everything froze and I had to reboot. Then, again, a few mins later (listening to music and looking at pictures), it did it again. On the second time, I was not able to reboot the phone using the power button (keeping pressure for 10 seconds). I had to do it using the volume down/home/power. The phone screen was totally black and there was no way to unfreeze it. My notification light was flashing blue (as I had new emails and text), but the phone was not responsive at all.
It seems like Samsung just removed the SD notification as a whole in the new phone but did not fix the issue.
For those who don't have the issue, before commenting, I would appreciate if you could listen to music and look at your pictures at the same time (all from the micro SD card) for at least 30-40 minutes.
I strongly believe that ALL phones have this issue, but that those who don't just have not access pictures while listening to music (demanding on the SD card reading). Do it if you can... and see if it creates problems. And let me know once you did the above. Thanks.
I want to add that I am a computer/smartphone savy. I flashed ROMS on all my S1, S2, S3, S4. I also did thought it could have been my micro SD the problem (even if it works perfectly with my S5) so I went and bought a Samsung evo 64gb... Same issue. I reformatted both from PC and within the phone and factory reset (on more than 8 occasions). Same issue with all. My S5 doesn't have any issues with both SD. So no it is not the SD the cupid.