top 250yn problem

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good afternoon
For a long time our company has been using the TOP250yn circuit, however we are having recent problems where the IC does not support full load, considering that we have not made any changes to the design!
the CI when we apply load simply shuts off in a few seconds turn it on again. I ask for help because we are having difficulty in serving our client!

follow diagram to anelise!

Hi sharley,

Can I ask what kind of fault do you see? Does it auto-restart or just go out of regulation? Power limit?

Can you send the switching waveforms? Thanks!

Regards,
PI-Pike