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TPS7A4201: Output Voltage drop when a Phone (DECT) is near

Part Number: TPS7A4201
Other Parts Discussed in Thread: TPS7A4001, TPS7A4101, TPS7A49, TPS7A16

Hello Team,

I have here an LDO with Vin=13V, Vout=3.3V. When a DECT Phone is near the PCB the Output voltage Drops. We tested the following:

1. changed Input Cap from 1-10uF

2. Changed caps from cermaic to electrolyt

3. removed Cby (cap parallel to voltage divider)

4. Changed divider resistance from 100k to 10k to increase current through devider

Please see attached schematics and plots.

any idea????????????????

Best regards