The Big Question is........
Is it still freezing up?
renegade600 may be on to something, in that because of it's age.
The memory may be getting flaky.
I'm running into this issue with my one computer.
I just haven't gotten around to replacing the one bad bank of DDR 2 Memory Sticks yet.
As for repair of your Samsung tablet 4.
Just get what you can off of it, and replace it with a new one.
Unless you want to DIY the repair, but the cost of a replacement Mainboard is going to run as much or more than just getting a new tablet.
Signed: Ensign Tzap