Found a problem with automatic mapping from evidence from other users.
The snippet of log file you provided which only covered 27 minutes of time did not show any uPnP port mapping and only covered the time when you used manual port selection. So based on the evidence you supplied - the only issue i could see is the one i mentioned already
It is very possible that you have the issue with auto port upnp mapping that the 2 other users who provided logs have - but without logs i cannot say
