[2020] Critical Error

Could you please do this:

https://na.wargaming.net/support/en/products/wows/article/19498/

Could be a temporary issues with server you were joining or something. If it is not happening all the time, you are good. 

I would definitely run a WGcheck report and submit it to the Support team in a ticket so they can review.

Also, make sure you've updated your device drivers and Windows updates are current.

#anchorsaweigh

I would recommend trying to a do a "Check & Repair" from the Game Launcher. Sometimes files or data get slightly corrupted and fail when trying to load.

There is an update tomorrow, so maybe something went a little strange as the Update was downloaded?