I'm with @jdsilva - i think you'll get exactly what you have now since it is still a current model.
I've never had one of these units terminate. If this has happened more than once you should take a closer look at your power solution. Specifically, I think I would get someone to check your power factor, any frequency harmonics, and leakage between phase and ground, and the general stability of the frequency of the supply. You may need an electrical engineer rather than a sparky to check this.