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OPA2735求助,帮忙分析一下为什么我的差分放大电路不起作用

Other Parts Discussed in Thread: INA282

下图是我设计的电路,本意是通过R9采样电阻取得电压,并通过U5组成的电压跟随器缓冲后,最后由U3构成的差分放大电路放大最初取得的电压差值。但实际样品做出来之后,U3的差分放大电路输出的电压和理论值差别好大,而且工作几分钟后功耗会突然增加,U3发烫。请问是怎么回事?是我电阻太大,还是哪里设计有缺陷?