Why does my SD R/W work sometimes, but not other times?

I have Baseband G900AUCU2ANG3
Rom is 4.4.2
Build number KOT49H.G900AUCU2ANG3
It is a rooted SM-G900A with safestrap installed and working.
Heres my problem. I am having problems with writing to my External SD card. I used app2sd to move only the apps that are specified in the app manager as moovable, and had success.
But I used SDfix for correcting the r/w of the sd with limited success. Though most pics moved successfully, lately, when I move them, some "break". Also, I have around 20 movies on the SD working, but, also lately, when I move newly downloaded movies, sometimes I have success. Other times the video only party transfers or breaks completely. The wierd thing is that the same video can do all three things. Break sometimes, partially move, and in some cases successful transfer. I have checked the permissions of everything and it seems to check out. I have busy box pro and rom toolbox pro installed also, but even using rom toolbox i have the same problem. I have even tried my pc, but when I put the SD back in my phone, same thing. I also noticed that some items successful moved will be either broken later or just gone. This includes photos, movies, saved PC programs and more. Can anyone help me figure this out. Ive tried and checked everything I can think if.

Home button sometimes not working and Screen randomly shuts off

I'm using my dad's Note 10.1 (2014) and I've been experiencing some problems. The screen would randomly just turn off (but it doesn't shut down) when I looked away. I thought it was the smart eye detection feature thingy but when I checked, it was already turned off. Another problem is that the home button and/or the capacitive just randomly stops working. Had to reboot the device in order to get it working again. At first I thought it was some hardware problem but I'm pretty sure it isn't. So yeah. Does anyone face the same problems? I've heard this device have some software issues that causes this but after some searching I got no answers.

Note 5 sometimes freezes while unlocking

I have a weird problem my note 5 freezes sometimes when I try to unlock it and takes at least 8 to 10 seconds. Whatever taps I make during the time the fone is frozen it remains unresponsive but after a few seconds it responds to all the tap commands but after 10 seconds.
But after that initial problem it is perfectly normal and responsive.
How do I fix this issue and is it due to the aggressive ram management that it takes some time to load the home screen etc.

Wanted to know if anyone is facing this same issue and if there is a solution for it.
Thanks

Note 5 sm-920I model