Lantus/Novolog Issue

So recently I've been having an issue where my sugar has been spiking beyond my corrections. Sometimes I will eat my normal amount of carbs, take 2-3 units more of Novolog, and wind up in the 300s. Over the last week, I've upped my Lantus by 10 units with no success in stabilizing my sugars during the day.

Important notes: My weight has not changed at all recently, my activity hasn't changed either since I still go to work, and I don't feel sick.

Any ideas?