For some reason the system uptime on my 2710n (firmware 3.6.3.2_2471201) appears to keep resetting to zero even though the WAN uptime increments correctly and seems to be closely in line with the elapsed time since the router was last rebooted and the ADSL connection re-sync'ed.

For example, the system uptime is currently shown as 1d 21:45:17 but the WAN uptime is 191:22:46, ie. almost 8 days.

I've tried setting the router to get its time both from the local PC ("browser time") and off t'Internet using NTP but the behaviour of the system uptime is the same whichever time source is used.

Anyone got any ideas why this is happening - is it a firmware bug that hasn't yet been sorted out?

TIA