System hard-freezes and reboots shortly after startup

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Hi all. My brand new Pinebook Pro has been working fine since Monday but I've been having issues with it today. Around 30 seconds after the login screen displays the system freezes up for around ten seconds and then reboots. I'm running the default image and haven't changed any settings on the machine.

If I tail /var/log/syslog this is the last message I get before it locks up:

Code:

serial8250: too much work for irq35

What are my next steps? I'm not sure how to debug this.