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TPS65132: At some startups the preprogrammed output Voltage is set wrong.

Part Number: TPS65132

We use the TPS65132B5YFFR with +/- 5.5V output preprogrammed. We don't programm the device. Around once every 20th startup the ouput voltage is +/- 4V instead of the +/- 5.5V. If the part is resetet with the enable pin, the voltage changes to the desired Voltage. To take away the load didn't help. Used circuit below: