No start up of TNY266GN (creating to little supply voltage?!)

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we are useing TNY266GN in mass production and we have about 1% male funktion of the TNY266GN after power up. After that we have to replace the device.
With a new device it is everything fine and the SPM works.

The supply voltage of the TNY is rising to 3.8V and the multi funktion pin, where the optocoupler is connected, is rising to 1.4V, nothing else happens.

The 99% of the SPMs are working fine.

So where can I start searching for the reason?

Thanks in advance!

Best regards,