QUOTE(waveweaver @ Nov 8 2015, 10:31 AM)
Something fishy going on with my phone. Last time send to ICU coz it keep unmount and remount my 64GB Sandisk sdcard. No problem with 16GB Sandisk sdcard though.
The SC said they change the motherboard . Unfortunately the phone came back with same imei number and even have all my previous apps, messages and contact numbers inside...which let me to believe that they actually didn't change the motherboard at all.
Phone problem still continue after that. I feel really frustrated and nearly sell the phone. Then yesterday I bought a new 128GB Samsung Evo sdcard and walaaa...problem solved with not even a single unmount and remounting happen..!!
Do any of you have this same unmount and remount problem with 64GB Sandisk sdcard.? I'm sure my Sandisk sdcard not corrupted as I've format it a few times already and it working faultlessly in my Note 8.0 and original Note 1.

Bro waveweaver....
I am also using64GB Sandisk sdcard since my Note 2 days.... When I got my Note 4, the card was transferred to Note 4. Everything works fine in both Note 2 or Note 4.
About your experience changing motherboard, Samsung SC changed my Note 4 motherboard when the touchscreen and capacitive button was faulty and the IMEI remained as before too. Even the apps that I downloaded were there. I became suspicious that the SC did not change the motherboard as claimed but when I browsed the internet, I found that there are several users from other countries also posted the same experience. I guess maybe Samsung SC have a way that the IMEI and apps remain the same.
Nevertheless, I am very happy with my Note 4.... Much better than my Note 2..