I started off with a pair of Sims boots. My feet would be fast asleep by the time I got off the lift. Switched from Gnu bindings to Ride, and the issue went away.
Next, I bought a pair of thirty-two boots and they killed my feet. So much so I couldn't ride at all. So I sold them.
Next, I bought a pair of DC Scout with Boa. LOVED them. So comfy and I really liked the Boa system. ..but they packed out quickly and soon my foot was sliding around. I also switched to the K2 Cinch binding at this time (great idea but the DC boot is so bulky is made getting into the binding a challenge at some times)
Now, I have a pair of Ride Flight with quick lace. They feel nice but I haven't rod them yet so we'll see. I also bought a pair of Salomon Rythm bindings to go with them.
...bottom line is it could also be a binding issue.