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Today, the most common problem in all ranges that we see (by several times) is that the board has failed. The fact that a particular range is more expensive than another does make it any less likely to have that problem.
They are affected by fluctuations in electricity.
When you consider that these boards are small computers and make the comparison to real computers, you could see the same thing. If you buy a more expensive computer it is not less likely to have a board blow on it.
Let me know if you would like more information and/or clarification.
You can ask Sears if they record these problems and if they can tell you if the particular model that you had has been having more problems than their other ranges. Without their recording of issues you really could not tell if the problem was a fluke or has been coming up more often with that model.
There isn't any proven technology that can be used to be sure that the board from a 220 volt range won't blow. You might try a whole house surge protector if you do lose electricity often.
If you have someone who has electrical experience, it is not hard to install. You can get them from approximately $60.00 and up. If you pay an electrician to do this, you probably will add $150.00 or more to the cost for labor (depending on who you get).