Fitbit issues (losing active minutes and cals)

So I use my Fitbit as a rough guide of calories and mostly use it to track steps but I'm getting annoyed because I take a few bigger walks throughout the day and I notice that my last little walk to finish the 10k/day job ends up being the only activity tracked. And my calories drop way down which makes me pissy because data lol is anyone else noticing issues with theirs?