The errors got more informative. It's definitely being caused by the 
external drive I am using from time to time. Obviously it's crashing due to 
the periodic nature of remounting the devices that udisks uses and happens 
when I unplugged the external hdd earlier, not quite sure why it's not 
event based rather than interval based.

On Sunday, September 6, 2015 at 1:07:52 PM UTC+3, Frankie Wild wrote:
>
> dbus-monitor --system
>
> dbus-monitor: unable to enable new-style monitoring: 
> org.freedesktop.DBus.Error.AccessDenied: "Rejected send message, 1 matched 
> rules; type="method_call", sender=":1.68" (uid=1000 pid=28279 
> comm="dbus-monitor --system ") interface="org.freedesktop.DBus.Monitoring" 
> member="BecomeMonitor" error name="(unset)" requested_reply="0" 
> destination="org.freedesktop.DBus" (bus)". Falling back to eavesdropping.
> signal time=1441533725.361185 sender=org.freedesktop.DBus -> 
> destination=:1.68 serial=2 path=/org/freedesktop/DBus; 
> interface=org.freedesktop.DBus; member=NameAcquired
>    string ":1.68"
>
> dbus-monitor --session
> signal time=1441533710.331885 sender=org.freedesktop.DBus -> 
> destination=:1.6 serial=2 path=/org/freedesktop/DBus; 
> interface=org.freedesktop.DBus; member=NameAcquired
>    string ":1.6"
> signal time=1441533710.331920 sender=org.freedesktop.DBus -> 
> destination=:1.6 serial=4 path=/org/freedesktop/DBus; 
> interface=org.freedesktop.DBus; member=NameLost
>    string ":1.6"
>
>
> This might give some clue if someone else is experiencing a similar 
> behavior. 
>
> I have also tried to exclusively stop the remounting of the devices over a 
> certain period of time, since I suspect this is the case when the crashes 
> happen.
>
> udisks --inhibit-all-polling
>
>
> Or 
>
> udisks2 --inhibit-all-polling
>
>
>
> Both resulting in command not found. 
>
>
> On Sunday, September 6, 2015 at 12:31:46 PM UTC+3, Frankie Wild wrote:
>>
>> Interestingly enough it seems related to the udiskd daemon. At least this 
>> is what I am seeing for a second in the log upon crash before being 
>> presented with login screen.
>>
>> Another thing I've noticed is that about the same time the crashes 
>> started a glitch in E19 appeared as well. Again random, when I am trying to 
>> close a window on the taskbar the mouse would move precisely to the center 
>> of the screen and does that constantly until reboot.
>>
>> On Friday, September 4, 2015 at 6:50:49 PM UTC+3, Frankie Wild wrote:
>>>
>>> I believe it's since I installed latest updates two days ago. 
>>>
>>> At the time it occurs I get a black screen with a few lines of errors 
>>> and then back to login screen.
>>>
>>> I couldn't memorize what the errors were at the time. I have checked all 
>>> logs in /var/log to no avail... 
>>>
>>> Where could they be, so that I can post more info on the errors ? 
>>>
>>