I press ALT+TAB and do other thing when I get back to minecrat is crash

 this has been a problem I've had for a very long time now, and I guess lately I've gotten sick of it enough to do something about it. I'm your average gamer, I play a large variety of games on Steam and out of Steam, and each game I play I prefer to have fullscreen on. In Minecraft, unfortunately, having fullscreen on never really lasts for me, because every time I alt-tab to switch to a new window and go back to Minecraft, it's back in windowed mode. I then have to go back in to the settings, turn fullscreen off and back on again to get it back to fullscreen.

AL lib: (EE) MMDevApiOpenPlayback: Device init failed: 0x80004005
<log4j:Event logger="chm" timestamp="1530812698048" level="INFO" thread="Thread-3">
<log4j:Message><![CDATA[OpenAL initialized.]]></log4j:Message>
</log4j:Event>

[22:30:31] [Client thread/INFO]: Setting user: smallblue32
[22:30:32] [Client thread/WARN]: Skipping bad option: lastServer:
[22:30:32] [Client thread/INFO]: LWJGL Version: 2.9.4
[22:30:33] [Client thread/INFO]: Reloading ResourceManager: Default
[22:30:33] [Sound Library Loader/INFO]: Starting up SoundSystem...
[22:30:33] [Thread-3/INFO]: Initializing LWJGL OpenAL
[22:30:33] [Thread-3/INFO]: (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
[22:30:34] [Thread-3/INFO]: OpenAL initialized.
[22:30:34] [Sound Library Loader/INFO]: Sound engine started
[22:30:37] [Client thread/INFO]: Created: 1024x512 textures-atlas
[22:30:38] [Client thread/INFO]: Narrator library for x64 successfully loaded
[22:30:57] [Client thread/INFO]: Connecting to mc.hypixel.net., 25565
[22:31:00] [Client thread/INFO]: [CHAT]
[22:31:00] [Client thread/INFO]: [CHAT]