Ubuntu 18.04 randomly freezes indefinitely

I switched my os from windows 10 to Ubuntu 18.04 because some drivers were unsupported and i switched. Since ive had Ubuntu every now and then my laptop freezes and doesnt unfreeze so i have to do force shutdown. Now it almost freezes everyday. It might also be becuase i have two different 4gb ram sticks.

Specs:
-Computer- Dell Latitude E4310
Processor       : Intel(R) Core(TM) i5 CPU       M 540  @ 2.53GHz
Memory      : 8076MB (4926MB used)
Machine Type        : Laptop
Operating System        : Ubuntu 18.04.4 LTS
-Display-
Resolution      : 1366x768 pixels
OpenGL Renderer     : Mesa DRI Intel(R) HD Graphics (ILK)
X11 Vendor      : The X.Org Foundation
-Audio Devices-
Audio Adapter       : HDA-Intel - HDA Intel
-Input Devices-
 Lid Switch
 Power Button
 Sleep Button
 Power Button
 AT Translated Set 2 keyboard
  USB OPTICAL MOUSE
 AlpsPS/2 ALPS DualPoint Stick
 AlpsPS/2 ALPS DualPoint TouchPad
 Video Bus
 Dell WMI hotkeys
 Laptop_Integrated_Webcam_2M: In
 HDA Intel Dock Mic
 HDA Intel Mic
 HDA Intel Dock Line Out
 HDA Intel Headphone
-Printers-
No printers found
-SCSI Disks-
ATA ST9250414ASG
TSSTcorp DVD+-RW TS-U633J

If you would like more info please inform me on how to obtain it cause i am relatively new :).