1. Take it to a reputable Mitsubishi dealer.
2. Check to make sure that it doesn't have miss-matched tyres.
There have been posts here about the problems caused by having different tyres on the same axle, and the description of your problem sounds familiar.
The car's systems expect the tyres to EXACTLY match, so a different tread pattern, or amount of tread, or size of tyre can all cause the car's systems to panic.
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