FWIW I have the same Billion Router. I was away last weekend, and when I got back on Tuesday last my speed had increased to the following:
Upstream rate = 13787 Kbps, Downstream rate = 59779 Kbps
I normally get an email from MyDSLWebStats when I've had a resynch, but nothing was forthcoming. According to them, my last resynch was on August 8th. So, I've had a fairly substantial increase in speeds both up and down, but no LOS. Must have been DLM, and so quick it didn't register as a disconnection.