Hello,
I got a freeze problem when I was using internet navigator intensively, opening lot of new pages.
As I am using a SSD, I put tempfiles in RAM to limitate SSD access.
Using the command "df -h" I was able to see my tempfiles where full and it was the reason of the freeze.
Solution : I updated file "/etc/fstab" to add or modify following parameters :
tmpfs /tmp tmpfs defaults,size=1G,noatime,mode=1777 0 0
tmpfs /var/log tmpfs defaults,nosuid,nodev,noatime,mode=0755,size=2% 0 0
#
none /sys/fs/cgroup tmpfs defaults,size=20M 0 0
none /run tmpfs defaults,size=90M 0 0
none /dev/shm tmpfs defaults,size=800M 0 0
And it's working fine !