Turns out to be more than that. I reinstalled udisks2 with external drive 
unplugged. Now the occasional log-outs happen with the notice udisks2 
successfully reinstalled... 

It happens about 10-15 times a day, so I am at the point of reinstalling 
the whole system or trying out Manjaro OpenRC, although I like Void and am 
sure that udisks2 is used throughout all distributions nowaday, replacing 
the good old HAL.

On Sunday, September 6, 2015 at 8:37:26 PM UTC+3, Frankie Wild wrote:
>
> 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 ? 
>>>>
>>>