why my arduino is restarting when using two servos?

when iam using onlly just one servo, my arduino is worked fine, but when iam add more servo, my arduino is restarting. iam powering the two servos using laptop port that connect to arduino. how to fix this? thanks

Power source is not capable of handling the peak load of two servos, use a different power source (it a good practice to use separate supply for motors anyway, since they are good at generating potentially disruptive noise on the power rails.