Disappointed in this specific calculator

My daughter needs this calculator for a class in school. The first one lasted a year and a half which isn't typical of a Texas Instrument. My son has a different calculator he's been using for 4 years and it is still going strong. I bought the same one that she had because it is what she insisted she needed. It worked for a few weeks and all of a sudden stopped again. Her teacher even looked at it to try to figure it out and couldn't. I played around with it and reset it a few times and left it out in the light to charge better and it works sporadically now. Won't buy another one.

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