Hello @Steve.Taylor,
In reference to this SIM card issue and the firmware 7.1.2 release as mentioned here Balance/MAX Firmware 7.1.2 RC1 & SD Switch Firmware 1.2.0 RC1, we do not see this SIM card issues being mentioned in the release notes of bugs fixed, can you please verify for us and also if this bug has been adressed in the firmware 8.x beta release?
Happy to Help,
Marcus 
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