Yes, it could be your electric power steering, they can work intermittently causing the steering to be easy or difficult as the power steering goes on and off again, clean and check the electrical terminals and check the wiring if it continues it may require a new power steering and rack. *safety note potential hazard item*
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Smart Car Specialist
Unit 10
Foundation Units
Westfield Road
Slyfield
Guildford
Surrey
GU1 1SF