this happened to me in feb exactly like this no warning no nothing and i checked my posts i didnt have any posts that break their terms and i couldnt reach them for help and some friends when they checked my profile it says i have suspicious activity kind of warning too and so i kept trying to find way to retreive it and gave up after 4days of being stressed about it and then after a week i tried again to log in and suddenly my access was back but lost all the folowers and following but only for a day but the count went down when it returned