Sorry to come back late.
For power consumption measurement, please refer to table 53 on PTS:
http://developer.sierrawireless.com/Resources/Resources/AirPrime/Hardware_specs_user_guides/AirPrime_WS6318_Product_Technical_Specification_and_Customer_Design_Guidelines.aspx
My test done is kind of causal, for example, I am using dev.kit with live network SIM whereas the environment is not well controlled and value must be higher than the spec, still I am getting ~7mA in sleep mode.
There are also some tips to get lower power consumption in PTS section 6.3.
What’s the current draw in your case?
Does issue happens on multiple modules? Or if you can get one dev.kit to test?
Any advice from your distributor?
Hope this helps.