The first BSOD (0x00000139) occured this year January 2 and never happened before.
After core dump analysis I came to conclusion that this error happens because because of a network adapter.
January 4 after a BSOD during the night I tried to manually reproduce this error.
Experimentally, I found out the moment the error occurs - Computer maintenance Screnshot 3.
Error dates can be found on Screenshot 1.
After reinstalling the Hyper-V network adapter (2015-01-04T15:18:48 as seen on Screenshot 2), the error during computer maintenance has stopped to occur.
The next error (February 4) happened roughly after a month (date diff) during automatic system maintenance.
As seen on screenshots, the network adapter I removed after the error occured, has been installed after 2 days. This error had happened today, after a month (date diff).
As you can see on Screenshot 2, the first configuration of this network adapter was on December 2 2014 (one month before the first BSOD (0x00000139) occured).