Your problem seems to be very common on the 1771. My experience is that the feedback input is e x t r e a m l y sensitive to interference. Try to decouple it to ground through a few hundred pF and the problems might go away. I have not found the exact reason to my own problems, but expect it's pulses injected to that input in some way that changes the setpoint if the switcher is on or off. The data sheet advices against a decoupling, but it seems to work.
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