I got the same problem and imho its a problem of WG.
I contacted the support and was recommended to reinstall WoWS (without activated anti-virus and friewall).
I did and afterwards I had the same problems...
now, after several advices, WG told me, not be able to help and to wait for todays update... so lets wait for afternoon and retry...
besides, WG support seems not to be very capable, e.g. they told me mods are the problem, altough I told them, I already reinstalled the whole game without mods....
then the driver of my graphic-card should have been the problem, altough I told them before, that after I got this problems, I changed grpahics from AMD to Nvidia....