It starts inching up to 37oC then goes down. At this point I'm still getting shares. Then it goes to 42oC and down to 38oC. Then it goes back up to 44oC. After this, it stops getting accepted shares.
This suggests that you have a USB problem, not a heating problem.
You're running extremely cold, which means you're not hashing.
Is something you're running cranking your CPU to 100%? Like are you trying to CPU mine simultaneously?