Why does my LG G3 D855 Android 5 (Lollipop) keep Re-mounting SD card and Rebooting for invalid SIM?

[Vikesh1]

Using for last 1 year, my LG G3 D855 is running on Lollipop (Android version 5), for the past one month I'm encountering following issues,

1.) The Sandisk 16Gb SD card keeps randomly unmounting then re-mounting itself. Whenever i attempt to access anything on the card, it immediately unmounts itself.

2.) Phone runs hotter and it seems the heat is around where the sd card/sim card is mounted. It would say INVALID SIM and reboots on its own.

Can somebody help me? How can I get above 2 issues resolved?

 

[B. Diddy]

Welcome to Android Central! The first thing I would do is try a different SD card. The one you have now might be failing, which can cause various issues.

 

[Vikesh1]

Yes I tried a new SD Card, issue is still the same. Though the frequency is reduced.

 

[B. Diddy]

I wonder if there's a problem with the SIM slot, then. Try cleaning it by blowing it out with a can of compressed air.

 

[DaniBg]

Hi, i have the same issue with my LG G3 D855. Tried everything with the SD card and works on all other devices such as another G3 and PC.
SD card mounts and unmounts itself constantly. Sometimes is not visible at all for hours. Then it comes back for a short period of time and disappears on it's own.
Really annoying.
Tried different SD cards, same result :/
Any ideas on how to tackle this baby?

Thanks!!