Turn off the convection setting and bake on regular heat instead - that's usually your best bet for cookies. Convection ovens circulate hot air constantly, which speeds up browning on the outside while the inside hasn't had time to set properly. Since you're getting that uneven bake, the convection is probably working against you here.
If you do want to use convection for some reason, drop the temperature by 25 degrees from what your recipe calls for, and keep a close eye on them starting around the two-thirds mark of baking time. Also rotate your baking sheet halfway through - move it from front to back. That helps even things out, though honestly you'll still get better, more predictable results going the regular oven route.
One more thing: make sure your oven is properly preheated and check if your rack position matters. Middle racks generally work best for cookies. Sometimes the issue isn't really the convection setting at all, but just uneven heat zones in the oven itself. If you're still getting hot spots even on regular bake, try baking one sheet at a time rather than stacking multiple trays.