I used to have this problem with some 2820s, several firmware iterations ago. Resolved now (but later firmwares have introduced new problems!).

I'm wondering just how in-line the 2820 and 2920 firmware are? I'd imagine they are virtually identical apart from the lack of an ADSL modem.

There seem to be less 2920 firmware releases when compared to the 2820?

Can anyone comment on this? I've not done 2920 before, but have a client going onto FTTC soon so more desirable - I'm concerned that this 3G failover issue is current on the 2920 but resolved on the 2820 (but used to be a problem on it - WAN1 would fail, and WAN2 would never kick-in).

Thanks