@sparkydog1725 what are your Shields settings? Also, do you have anything set in Brave to clear cookies or anything?
What’s interesting is I never get logged out of Facebook. But I do see where others reported this issue months ago at Brave Keeps Logging Me Out Of Facebook
It seems back then it was mentioned to be a server side check. So if IP was changing or whatever. The latest comment from someone mentioned messing with DNS settings.