Share your experience!
The first problem is true especially big apps like gamez over 100mb
It'll keep happening, maybe sd card compatiblity for kitkat problem
The second is true but rarely happened to me
But sometimes restart needed to solve it
For the third it seems to never happen to me though 
I think there's no solution for those things for now, except a firmware update
For uninstalling kitkat you can't, except getting root and unlocked bootloader and flashing the kitkat firmware.
As my experience the thing that causes this things is deffinitely the 4.4.2 kitkat. As I reckon even other brand phone got this problem at 4.4.2. It the kitkat problem that's why google launch the 4.4.3 and last 4.4.4 kitkat
The 4.4.3 fixes many bugs and compatibility issue that sometimes break the apps and restriction of External SD Card.
That's all that I know
Correct me if I'm wrong 
check old topics some one given some solution in past i guess