The Faq (https://hub.sp-tarkov.com/faq/) has a section titled : "Endless loading / Stuck on splashscreen / Game crash to desktop" that may be of help.
Post
RE: KBM not working in game
I've had this issue in version 3.2.0, I figured it out that it happened if you had any item in special slot hotkeyed, but you didn't actually carry said item into raid with you. Solution for me was to simply make sure that I remove the hotkey of item in special slot if it isn't there.