Window resize lag causes disconnection

Back in 3.5 and 3.6 I played on R7 370 GPU and I had no such problem.

Now I play on RX 580 and after a while of playing (unspecified) doing either:
* switching fullscreen to windowed fullscreen
* switching fullscreen to windowed
* switching windowed to windowed fullscreen
* maximizing a window (keeping it a window)

...takes few seconds and once finishes, the game puts me back on the loading screen with the abnormal disconnection error.

I've tested my PC thoroughly and found no issues related to the hardware, drivers, operating system (events).
Performing identical actions in other games (DX9, D11, DX12, OpenGL) causes no similar lag, therefore I deem this a PoE issue.

The specs more or less are:
* AMD FX-8350 (octacore 4GHz)
* 16 GB RAM
* AMD RX 580 4GB
* I run the 64bit game from the SSD Samsung EVO 850
* All that on Sabertooth 990FX Rev. 2.0
* on Windows 7 x64 SP1 Ultimate, up to date

The temps are as follows after running several maps



Other than that, the game runs smoothly and I get no other disconnections... mostly ;)