3g and wifi issues on ICS

[solverone]

I have noticed that once I switch off my wlan radio and use only 3g radio on, the device keeps restarting all by itself. when I switch back the wlan radio it stops restarting. I thought it must have been a former setting issue during the upgrade conflicting but I did a factory reset and its still the same. anyone experienced this?

[tobyg]

Did you add your own Gobi 3000 card or did yours come with the WWAN card?  I added my own.

I was having this problem too.  Every 1-4 hours it would reboot with 3G (Now shows as 4G though) enabled.  I did a factory reset (I didn't want to, didn't want to risk losing root, but root was maintained) and it did not help.  I left it in the dock overnight with 3G disabled, uptime was 12+ hours.  Enabled 3G, and could never get more than 4 hours before a reboot.

I ended up having another Gobi 3000 card laying around and swapped it, and now my tablet is 100% stable.  I'm not sure what the problem was exactly, if it's a bad card, different firmware, etc.  I do know the card I put in that is working is older than the one I had in there.  My guess is some sort of firmware issue, but I haven't gone that far to troubleshoot it now that mine is working well.

[spip72]

I do not have the frequent restarts that you do, but the tablet does drop the 3G connection a few times a week, and only remedy is to restart. Also, sometimes the tablet just closes down. This often happens when it's idle in my bag on my way to work. Maybe related?

[solverone]

I added mine too. I can confirm that the workaround the issue is ensuring that wlan is left on even when I am out of my wifi zone. it never restarts but once the wlan is put to off, the issue starts again.
I can almost be sure that its an issue with 3g connectivity but why wlan keeps it up is a mystery.