The server is setup headless. What about the guest os running in the vm. Is that also headless?
Reason i ask, is i read that virtualbox sometimes has problems when a guest os requests to sleep. Perhaps checking power management settings in the guest os to make sure it is always on and never attempts to sleep.
Just guessing right now, as i really have no clue, so i could be way off.
Also perhaps the amount of memory assigned to the guest os. Could available resources be a issue.
Thanks. I didn't see anything in the settings for power management. I may need to do that at the command line.