Did you update the firmware on it recently? There were a few reports lately that after a firmware update, the SLZB reverted to USB mode. Maybe the same bug which caused this also caused it to start broadcasting the AP.
I don’t own one of these, so this is pure speculation on my part.
Z2M & ZHA are 2 different zigbee integrations. You can’t possibly be running both on a device with a single zigbee radio. I know there was some kind of hacky way to do it (this one), but it’s absolutely not recommended.