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TPS62736 out of regulation

Other Parts Discussed in Thread: TPS62736

Hi,

in my application I use TPS62736 powered directly by li-ion battery. The TPS62736 circuit is like this: Cin = 4.7 uF + 100 nF, L = 10 uH, Cout = 22 uF, EN1 = GND, EN2 = VIN, voltage divider uses 500 - 900 kOhm resistors to set output voltage to 1.8 V, peak output current is 20 mA. Sometimes (5% occurence) when I quickly disconnect and again connect the battery the output of the TPS62736 goes and stays on approx 3.3 V. I then have to disconnect battery, wait for Cout discharge (or discharge it manually). Only after that and after connecting the battery TPS62736 outputs again 1.8 V.

Can you please help to resolve this issue?