Trouble with new Lxx type R

[stealthboy]

Hey all, I know there are some really smart people on here, not to mention a lot that have had experience with trial and error, so i figured it'd be worth a shot to ask a question here. i recently purchased an Lxx Type R 35 mhz Zent Supra set from toyeast... it worked great up until...well...it stopped working. Anyways, my problem is is its range suddenly shot down out of nowhere from 10 feet to about six inches. I don't know if there is a crip cap anywhere on these pcbs or the controllers, and i even replaced the stock car antenna with a new solid copper one, and still i got nothing. I've checked for the most obvious mistakes, and I haven't messed with the board other than desoldering/soldering in the new antenna. has anybody else had a problem like that from they're Lxx Type Rs? Or perhaps somebody might know some things off the top of their head that could be the problem. The other two Lxx's <both type Rs> i purchased from them work fine. Could i possibly have recieved a defective one? If you guys think so, i'm pretty sure i can still return it...i've only had it for two days. Anyways, any help anyone could give would be greatly appreciated. Thx, you guys rock.

-Stealthboy