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Can 9160 power off before power off the modem?

Hi,

In our product, we use 9160 GPIO to control the system power. However, we found we can't power off when 9160's modem is in normal mode. But, the system can power off when modem is in offline mode and power off mode.

We use VDD_3V6 to supply 9160, when modem is not power off, the voltage will hold in 2.6V for a while which made the system can't power off. But when modem is in power off mode, VDD_3V6 can down to 1V immediately. Why? How can we avoid this?

So We can only power off the product when modem is power off. Is it normal in mobile phones or other IOT device? I means, is it popular that the product have to power off the modem before power off?

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