Being able to make it for two days makes me wonder what could have changed from before to after. Is it possible there was a server reset during that time?
There’s another thread trying to work out some elements of these lost feats (though in those cases yellow lotus potion seems to have been involved - so might be a different issue, or different parts of the same issue) - link here:
@Narelle might the difference of FullMetalMadcat’s experience also be useful data for your investigations?