Share your experience!
Just installed a new upgrade that was pushed to my M4 aqua (already on android 6). This upgrade will disable most of your apps that are on micro SD.
As I started reloading the apps, it spontaneusly rebooted twice........ and now... seems back to normal. So wierd.
If anyone knows what this new update (seems pretty large) brings I would love to know ....
I also face similar issue that after upgrade memory card apps were not detected and even couple of restarts didn't work. Ejecting Memory card and restarting phone did work but now I couldn't move apps to SD card. 
I believe this has been covered here:
/t5/Xperia-M2-M2-Aqua/Apps-on-SD-Card-disappeared-after-lollipop-upgrade/m-p/1166369