Need some advice fast

I have a Sidewinder 6500 ESP alarm/remote start system in my car. This alarm is made by DEI, who also makes the Viper, Hornet, Python, etc. Has anyone ever started having a problem with their transmitters? I've changed the battery in each, and the LED's on the remotes light up bright so I know it's not the battery. The range on them both is really quite poor now; and they don't seem to work real stable (I have to push the button a couple times in order for it to work). One of the remotes has to be held right up to the windshield in order for it to work. Before I go Ebaying for new remotes I want to make sure that is what it is exactly. If anyone has any knowledge what-so-ever of DEI's (Directed Electronics www.directed.com) systems, or has every experienced transmitter problems, please let me know. Thanks.

Also, I've deleted each transmitter and reprogrammed them several times without any change in their performance.

Well, I've been reading through and saw that people were saying to place the transmitter under your chin. This is really weird, but the transmitter went from only working when I was touching the windshield, to working up to 100 yards away, but when I walk back up to the car, and just point and press, nothing- until I press it against the windsheild (where the antenna is mounted). Is this an indication that their might be something wrong with the transmitter? The previous couple of years I've had the system, I've always just pointed the remotes at the car and it worked over 100 yards away. Who knows how far I could have gone doing the chin trick back than. Let's see, 1 foot to 300 feet, so 300 to 90,000 feet (300 times farther)! Okay, I'm just being stupid. But does anyone know why the remotes might be acting funny like this?

By the way, I tried the chin trick with my girlfriends factory alarm and remote for her 2k1 Neon. It went from about 40 feet, to close to 70 yards!

The antenna is mounted the same way it always was. Like I said, before it worked just fine.

Well, thanks for all the great advice people. First, let me say that the system was installed in my car when I bought it. The previous owner did give me all the receipts and warranty information that went with the alarm; but it states in the warranty that it is only good for the original owner and only if they sent in the warrenty card. So, even though they do have a lifetime warrenty, I'm sure they would jerk me around and wouldn't give me crap. So, after that, let me clear up exactly what happened because I still think it might be the transmitters, and I am hoping it is .

Okay, about 2 or 3 months ago, one of my remotes wasn't working, or so I thought it wasn't. I replaced the battery and still nothing. So one day I was messing around with it and noticed it would work, but it had to be held right up to the windshield by the antenna. I just thought the remote was going bad, and it wasn't a big deal because I had another one. The other one worked fine; as well as it always did. So I used that up until now. This is why I believe it would be the transmitters and not the brain. Because why would one remote work fine, and the other not for that long of a time? There may be a reason; but if common sense serves me right- if it was the brain, they'd both stop working at the same time. But I could be overlooking something. Also, why do they both work if I do the chin trick or put my hand over it to use my body for more antenna? Like I said, I get around 100 yards on both if I do that. It makes me believe somehow they aren't transmitter correctly. Now, does anyone follow me, or am I missing something?

Thanks again for all the great input.