Need Help with 9,7"Cortex A9 dualcore 1.6GHz tablet (Lavios Dimira) ICS 4.0.4

Hi everyone.
I have an older tablet which is a Lavios(local brand) Dimira which always have a problem resulting in the tablet to freeze for a moment and "unfortunately android.process.acore has stopped" pop up and then you can close it. Obviously it make my tablet so slow and hard to use.
I can't pin point the exact problem(although OS related), but It looks like more often appear when something is loaded up, like when opening an app or even showing the keyboard.
It's seems to be OS related as other people who uses the same tipe of tablet have the same problem.

Now my question is how can I fix this pop up and freeze problem(the vendor doesn't have any software support)?
And is there any other ROM(custom) that can be used for my device (any ROM which work with similar specs device might worth a try) ?
Thx for all of your answers and tips, I really appreciate your time.



Model
Lavios Dimira DM9810G
OS
Android ICS 4.0.4
CPU
Cortex-A9 Dual Core 1.6 GHz
Display
9.7" IPS 1024x768 LG Display, (10 Point Capacitive Screen)
RAM
1 GB DDR3
Internal Storage
16 GB
External
Micro SD card up to 32 GB (optional)
Front Camera
2.0 Mega Pixel
Back Camera
2.0 Mega Pixel with flash
WLAN
Wi-Fi 802.11 b/g
Bluetooth
Built-in Bluetooth
Battery
8000 mAh rechargeable Li-ion Battery
Other
micro USB (OTG), mini HDMI, audio 3.5 mm jack, speaker, mic., G-sensor
HDMI
Yes
Gravity Sensor
Yes
Dimension
241 x 190 x 5mm
DC Adapter
- Input : AC100-240V.50-60HZ
- Output : DC12V 2A
Video
H.246, VP8, Real Video, WMV, AVS, MPEG2, MPEG4, FLV Video, MKV
Audio
MP3, WMA, OGG, APE, FLAC, AAC, WAV
Picture
JPG, GIF, BMP, PNG
E-book
TXT, LRC, PDF, HTML, HTM, EPUB, PDB, FB2
Language
Multi-language (optional)