I leveled up to levels 51 and then 52 in a fairly short amount of time, and when I looked at my feats to look at some of the great ones that unlock around then I saw that all my feats reset partially. All of them were yellow, but my available feat points had not been reset. I could still construct things and repair weapons as if I still had my feats unlocked. I could not learn any new level 51-52 feats though.
This did go away when I exited to the main menu and then reconnected, all my feats are back and properly green and unlocked again. I can keep an eye out to see if it happens again on the way to 53.