Not sure if anyone else has seen this with their own 167, but there seems to be a bug in the DSL Information widget on the dashboard.
If the DSL connection has been up for at least 30 days or so it seems to start counting backwards with minus figures.
Seems to have done it since the first firmware version and doesn't seem to be fixed in any of the subsequent versions I've installed so far.
I've attached a screenshot that shows this behaviour:
Apart from that, it's a very impressive modem. The stats are great and this has been a modem that has given me the highest sync rates and stability so far for the few months I've had it!