Laser driver

Hello everyone,

I am working on a project that needs to have a laser driver. Actually a laser array, so total current is around 2A. I am using LD39300 for creating a voltage driver, since it can supply upto 3A current. What I am facing is the at full power, driver runs for 30-40 mins and then starts malfunction and gradually dies.

If any of you have any idea or experiences, please share it here.