"No SIM Card Detected" all of a sudden

I’m using a Pepwave MAX BR1 Mini Firmware: 8.2.0 build 5167. Earlier today it was working fine. No issues.

I unplugged the router, and then later in the day, I plugged it back in to use again. This time, it won’t connect. The dashboard now says “No SIM Card Detected.” Nothing has changed since earlier in the day.

Any ideas? I’ve taken the SIM card out and put it back in. I’ve tried the B slot. Back into the A slot. Many power cycles. Nothing.