i've been struggling with this issue for weeks,tried everything and still didn't find a solution.
When i copy/cut large files, the tranfer speed suddently drops to 0kb/s and freezes.
It happens on operation within the phone and when tranfer file from pc too.
I've obiouvsly done dozen of total wipes.
I've tried different 4.4.2 roms.
I've tried different file mananger apps.
I've tried different kernels.
I've done a chkdsk on internal and external sd cards.
I've tried another external sd card.
So, because I was concerned about an hardware failure, I flashed the stock 4.1.2 rom.....used it for 4-5 days and the problem was gone.
Back to 4.4.2 and the issue is still here.
The strange thing is I don't have this issue with a fresh installed rom...it comes after configuring and using the phone for a while.
I've done an intensive google research,but seems no one has this problem,hope somebody can help