Potentiostat using AD711


I have created an potentiostat using AD711. Everthing seems to be ok, but after a while on or more of the opamps break downs. I dont understand why, so I hope any of you can help me. I have attached the schematic. I use a traco TEN8-1222 to power theese opamps. I toggle it on when to use the circuit to measure and tgogle off when not in use.

Does anyone has a suggestion on what the problem is?

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