Untangle stops traffic at 1:15 AM

For the last 3 nights at exactly 1:15 AM untangle stopped all traffic both in and out. On the first 2 nights it resumed proper functioning at around 3:15 AM without any intervention on my part. Last night it did not resume functioning and only returned after I rebooted it.

I do not see why in the world 1:15 AM is a time when the machine would stop transferring traffic, and I am wondering what I can do to correct this behavior.