Upwind has gone down a few times tonight. It started around 9:30pm. I did notice while monitoring the kernel log that the serial locked up after a string of error messages.
example: Jul 26 05:01:14 upwind kernel: viper_irq_handler: irq=2 spurious= 101001, #/sec=100000
The last crash occurred about 30 minutes ago. I will hang around the base for another hour or so.