If it failed in safe mode, contact the seller for another replacement or a refund. (In the future,
don't buy Verizon Pixels. With an unlocked one, you could reflash the firmware, at least.) It's possible, but kind of unlikely, that 2 of them would have intermittent SIM ports, so it's probably the firmware. (If it's a currently-being-updated model - 2 or later - you can wait for today's update. Or download it at
Google | Full OTA Images for Nexus and Pixel Devices and flash it manually [it flashes in recovery, so you don't have to unlock the bootloader].)