If you keep having problems, then first try a gamefile check... if that doesn't help, then just remove the game and install it again (called a complete reinstall); that often helps all the issues go bye bye, with most games that receive lots of patches btw!

To do a gamefile check; right click the game in your library, then go to "Local Files" tab and there click the button; "Verify Integrity of Game Files"

if you ever had a gamecrash then the filesystem on the current open files (the gamefiles, d'oh) have a high chance of getting a little bit of corruption on the filesystem index... you won't notice as long as the gamefiles stay the same, but when they deploy an update that piece of corrupted index will cause problems as some of the data might get written to a wrong location or an incorrect location of the file will get new data and then not only the index might have corrupt data but then the files themselves can get broken while being written away...
The very next time the game accesses these files (eg: after an update) a lot of things can happen; crashes, errors, hanging game, missing/broken/invisible ingame content, a game that skips content (part of a level), etc etc so it's best to remove all files and reinstall them ... also, doing a checkdisk (in a Administrator-elevated CMD: chkdsk c: /f /v (repeat for all driveletters where you have software that could be affected, for the C: check it'll reboot and do it while booting, other drives can be unmounted live in windows) after the uninstall and before reinstalling ensures you that the new gamefiles will be written away properly and it'll keep your system & other software running properly from the harddrive(s) too.

So, in a nutshell: Uninstall Game
- Open elevated (as administrator) CMD
- type: chkdsk C: /f /v
it'll ask for reboot; if this is your only drive you may do a reboot after closing the cmd, if you have multiple drives with steam content or running software, then replace C: with that drives' letter and repeat till you had 'm all; you won't need to reboot for other drives then the one where windows is on.
- after reboot and finishing the chkdsk routine you can install pubg again; now you're sure it's fully updated and has no corruption

anyways, i hope this helps everyone who get sudden crashes, especially if it ran perfect before...
If you were already having performance issues then it might be that you need to tone down the settings, disable replays, ... to make sure your system is able to run pubg properly.

Now this part is especially for people who have less then 12gb of ram (btw if you have 12, replace the stick of 4gb by one of 8gb; the ram will run in full dual channel mode intead of L-Shaped Dual Channel, which is 25-40% slower depending on the task at hand).

Before starting the game close down al open software except steam (especially webbrowsers! they eat ram for breakfast) and close as many programs from the system tray as possible.
Shut down your antivirus; you don't need it while playing and it slows down the system a LOT.
If you only have 8gb of ram make sure you close everything from systemtray (onedrive, antivirus, mediatools, vpn-tools, ati-tools/nvidia tools/skype/messengers/printer driver/... only the Steam, Windows sound and Windows network icon should be there) and then even close explorer.exe with the taskmanager* just before you start the game; you don't need explorer while gaming... when finished gaming you can open the taskmgr (ctrl-shift-esc) and just start explorer.exe again to get desktop/startmenu back.. but it saves you a few 100mb (~250mb on my system) extra while gaming when it's closed AND gives some cpu+gfx resources free. If you have 16gb of ram then it's enough to just have other program's closed; the more memory free the better but 500-600 mb extra won't change much, while with a 8gb system it's a real difference and worth the effort.

Another In-a-Nutshell/kortgezegd/kurtzgezagt:
- close down as many system tray apps as possible; most can be closed with a right-mouse click
- shut down all running programs but steam (if you need a browser, use the one in the steam overlay, it uses far less extra memory)
- right before you start the game start the taskmgr (CTRL-Shift-ESC is a shortcut), go into detailed mode (show all) and then close explorer.exe (and maybe some extra of the system tray apps if you are SURE which programs they are)
- close down task manager, now start PUBG
- after pubg you can restart explorer.exe again with the taskmanager (ctrl-shift-esc) and goto menu "File", click Run/Execute and type explorer.exe

Now; i hope this helps you guys solve most of the crashing/Error issues when the game was running perfect before.

This guide is not intended for people who never were able to run the game (although checkdisk might help there in some cases); the guide also helps you to clear up some memory for the game (don't use so called 'booster'-tools for that, they do more bad then good)

A final advice i can give you if you only have 8gb and are having performance issues, especially if it's stuttering while on the move (running/driving) and not so much stuttering when you look around when standing still; try getting an SSD to install the game on. When i only had 8gb that helped me a lot, upgrading the ram to 16gb is also a good idea but in some cases more expensive; a second hand 40 or 80 gb ssd will do just fine for pubg; you only need about 10gb (+10gb for testserver if you wnat both installs)

Good luck on solving your issues and hope to shoot you down very soon :)

Greetz BoGy.