SIM7020E ignoring AT cmds

Hi,

  1. We sent an "AT+POWD+1’ cmd to a SIM7020E module, it did not enter sleep mode or power down.

  2. module still connects automatically to the lte network (network light changes from fast flashing to slow flashing)

  3. module does not respond to AT cmds any more, it just echoes them.

  4. current consumption in this not-responding-to-AT-cmds mode is 5mA, status pin is 1.8v

We’ve spent 2 days now trying to diagnose this. Can you offer any suggestions to get the module responding to AT cmds again?