Maruti Suzuki India — maruti ertiga zdi-sudden engine off and steering lock in middle of highways

I drive maruti ertiga zdi 2014 model (Tn 22 cq 3098) for last 5 years and total kilometer covered is 125000. Last week when i was driving in chennai - bangalore highway with my family suddenly the engine got switched off and the power steering got locked. I was driving at 100 kms/hr and think of the situation in busy highways road.
Thank god that no vehicle was behind me and really we escaped. But want to know how the issue is happening in middle of the highways? Who is responsible for the sudden engine shut down of the vehicle? Will the company pay for the service of this vehicle as it is technical fault.. I have 5 vehicles both commercial and personal of maruti but now scared if i need to continue with this brand... Will the company take this charge of the expense spent?