I agree that your body has adjusted to your routine and you need to change things up a bit... you can do this by changing your exercise routine - do things you aren't used to doing. Once your body gets used to a certain routine, that's just what it expects on a daily basis, so it's not longer a challenge. Same with your diet... change your calorie intake - increase by a couple hundred calories for a couple days, then decrease by a couple hundred calories for a couple hundred for a couple days, so your body won't know what to expect.
Frequently you will have a weight plateau. Mine lasted about 6 months. Have recently started to lose a few more pounds. Don't panic. Your body has adjusted to your regime.