I have to add a persistent concern and express that thought in the discussion about the erratic behavior of the step. The steps protrude their full width beyond the flared side of the Cruiser. That is what makes them useful. When mine first started plunging into adjacent traffic lanes, I was in severe big city traffic congestion, traveling at turnpike speeds in gusting winds and semi truck caused turbulence. Easy to imagine the stair cutting into another car as I was struggling to maintain a lane that was further complicated by construction obstructions and decayed pavement..
Unlike suggested by another respondent, I am concerned the unprompted step actions could plunge its steel edge into a vehicle in the adjacent lane. Driving the Cruiser in traffic, I have observed other drivers demonstrating very aggressive behavior. And, for no reason other than what is often told on RV Forums: "driving a motorhome displaying nonresident license plates". Lawsuits are commonplace in today's imperiled society. Ever drive in Mexico? Apply that mentality and you will appreciate my concern.
Only the day before the steps started going berserk, I had a driver accelerate to rush onto my blindside and remain there by adjusting his speed after I signaled an intended lane change. Fortunately, I have good mirrors and I use them. My advice - if you want to grow old and end up with two cents in your pocket don't trust anybody or anything.
Get the switch replaced. I doubt the problem will ever go away on its own. And, I am confident it will only get worse.