The answer to 'why is my outlet circuit overload' is that the circuit has been overloaded with too many electrical devices drawing too much power. This can happen if you have too many high-wattage appliances or devices plugged into the same outlet or circuit. Symptoms include the circuit breaker tripping, outlets not working, or devices not receiving enough power.
To solve this, you'll need to reduce the electrical load on the circuit by unplugging some devices, spreading them across multiple outlets, or upgrading to a higher-capacity circuit. If the problem persists, it's best to have an electrician inspect the wiring and make any necessary repairs or upgrades to the electrical system.