SuperR4i stopped working completely all of the sudden - help!

I was playing Grand Theft Auto Chinatown Wars (GTACW) on my DSi when the game froze. I turned the DSi off to reboot it, but when the DSi menu came on, the R4 icon was not available to be selected; so, I rebooted the DSi again and still R4 icon was not displayed in the menu. In fact, I even formatted the DSi to see if it will fix it, but it didn't; so, I formatted the MicroSD and reloaded all the required programs to make it run - still no R4 icon on the menu... What could have made this happen? Perhaps the R4 card got fried somehow, is this possible? I know for sure that my DSi is not the v1.4, and it was working perfectly until GTACW froze in the middle of the game....Background:
-Purchased the Super R4i and MicroSD cards from dealextreme.com
-Had the most current kernel loaded from www.super4i.com, which is v1.20.
-Using an 8 gig MicroSD card by Scandisk
-Had about over 50 games saved in the MicroSD card
-Have been using both cards for about a week or so.Mind you, I just discovered this "romulation-thing" not too long ago... still very new at this.Help!
iMDSi

Could be a contact problem. Try slipping some paper in the slot to push the R4's connectors closer to the DSi's.

Replying to #2

Tried this technique, but no cigar... Aaah!Might just have to pick up a new flash card...What's the most reliable flash card available? Are they all pretty much comparable of each other?

maybe your card is bricked
buy a new one like ezflash vi or acecard 2i

Cyclo DS is great, mine still works perfect after two years. They're also quite expensive though. In the cheaper end I hear a lot of good stuff about Acekard, both compatibility wise and reliability wise.