I tried a licensed cart and there's no problem there in sleep mode. Sleep mode also works perfectly on all the other games I've tried on the dstwo. Just not Advance Wars Dual Strike. (both the US and European versions)
I recently received a supercard dstwo from the affiliated shop and am currently very please with both the card, and the shop I got it from.
I have one problem though. While all of the games have worked perfectly so far Advance Wars Dual Strike while working causes the DS to play up in sleep...
One of the sites that weren't blocked on the school's network was some file uploading sites. I would upload some games, write down the URL and take it to school one day.
my school has a chrome extension called light speed filter agent and it legit blocks YouTube pfps since the file cdn(I think aka yt3.ggpht.com) is classed as mature
It was easy to bypass some of the restrictions, as one of the admins left a registry key in the administrative shares drive, which allowed me to get around the blocking of some sites.