As often as needed. A soft reset is non-destructive. However, repeated battery disconnects can wear battery terminals.
This is the safest method as it does erase your saved radio stations, navigation history, or paired phones. Ensure the engine is running or in accessory mode. mitsubishi multi communication system reset
If your screen remains black or "Check System" errors persist after these steps, it may be time for a software update via USB or a visit to your local Mitsubishi Dealer Service Center to check for hardware failure. authorized Mitsubishi service centers in your current area to help with a hardware diagnostic? As often as needed