I managed to get the wifi running (again), after very many annyoing month with 
Ubuntu.
So far I haven't experienced any any freezes. And this is what I did:

1. Download the latest wifi driver from Marvel:
http://git.marvell.com/?p=mwifiex-firmware.git;a=blob;f=mrvl/usb8797_uapsta.bin;h=0ce6c4ec307880d34bbef3b6ccd359617914f156;hb=e92f8b3f65443764297b947b1843955d9a65dde7

2. Backup and replace the outdated firmware file with the driver you just 
downloaded:
sudo mv /lib/firmware/mrvl/usb8797_uapsta.bin 
/lib/firmware/mrvl/usb8797_uapsta.bin.bak
sudo cp ./mrvl_usb8797_uapsta.bin /lib/firmware/mrvl/usb8797_uapsta.bin

3. Update Ubuntu's kernel to the latest stable mainline version:
https://wiki.ubuntu.com/Kernel/MainlineBuilds#Installing_upstream_kernels_.28manually.29
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4-wily/

4. Restart your system and boot the latest kernel.

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https://bugs.launchpad.net/bugs/1319366

Title:
  1286:2044 [Microsoft Surface Pro 2] Marvell 88W8797 not working in
  14.04 kernel 3.13.0-24-generic

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