fullscreen/windowed fullscreen related crashes

I've been playing poe for quite some time now and as of 3.0 (or maybe I just didn't notice it before that update) I've been having serious problems with crashes that appear to be full screen/windowed mode related. I've tried most settings (like switching to DX 9 and pretty much all other settings in that same tab) but the problems persist.

It usually occurs when playing normally. I'm in a map, nothing special happens and then suddenly my screen freezes and I am unable to give the game any form of input (my mouse and keyboard are not affecting the game at this point) The screen then turns black and starts to randomly go to windowed mode (if I was using fullscreen mode). I've had this happen while using both the windowed fullscreen mode and fullscreen mode. After the switch has completed (without me changing settings) the game continues as it normally would, only now it appears in windowed mode (and my settings still indicate fullscreen or windowed fullscreen) Pretty much all of the time I was not using any third party software (other than windows and firefox) when this happened!

It might be a different bug, but on some occasions the game doesn't even go back to any form of windowed or fullscreen mode (game screen remains black but appears in a windowed format) and just produces error messages (in the form of a windows popup) whenever I try to use any sort of input (mouse or keyboard). Clicking the x to close the program does not work and produces a popup error message. The game DOES produce sound again after the switch (my guess is that it's switching between fullscreen/windowed mode and that it just somehow gets stuck in that switch). When this happens the game seems to continue normally (with a black game screen and no way of providing input to the game). Alt-F4 or normally trying to close the window (or any other form of input) results in a pop-up screen with an error message. I can't reproduce that here at the moment since I play hardcore and I am usually frantically trying to close the game before I rip in-game (which has happened more than once now..). The only way to close the game is to force close the program using windows taskmanager.

Not sure if this helps to locate the problem, but my last rip with character Quibicle was an example of this. I was doing a zana mission coward's trial map, I was probably halfway with the waves for that room. I was not in any danger, had 100% health and there were no enemies already damaging me at the time of the crash, but the screen froze and after about 1 or 2 seconds the screen went windowed and black (an error message popped up whenever I tried to close the game with alt-f4, clicking the close window icon in the upper right) and (after the 1 or 2 seconds freeze, but while the screen was black) clashing sounds were playing in the background (probably of the skeletons that were half a screen away that had moved within melee range and by now started hacking at me) By the time I managed to close the game (via taskmanager) it was probably too late because when I logged back in I find myself in standard mode and I'm frustrated to have died at the hands of regular skeletons (probably) that normally pose no threat whatsoever. Detail to notice: there were no harbingers in the room (which have caused several crashes in the past for me as well, but that seems to really be a different issue):P. Also, I did not try to alt-tab or otherwise access another program while playing, and I did not do anything special in-game other than using the left and mouse key and the standard hotkeys for potions and skills 1-5 and Q-T. The fullscreen to windowed switch (let's call it that for now) just happened randomly while normally playing the game.