Even the best repair facility will miss what they can’t reproduce. Their test rig might be close enough to the load of an actual elevator to fix 99% of the problems but it’s not actually an elevator. Something is causing the problem. If there’s another elevator on the property with the same drive I would definitely try a swap. I once had the weirdest thing going on with an Otis drive. It had gone for repair twice, still did it. So early one morning I swapped it to another car and it worked fine there. Put the other car’s drive in my problem car and it worked fine too. Problem solved. It doesn’t always make sense.
I had the same with Otis drives!
