Everyone has issues at one time or another with the signal, mine was pouring down rain at a grocery store, arms full of bags. I ended up having to go back to the stores overhang, because i could NOT get the FOB to work
I hope you know there's a key inside the fob you can use hehe, i know it's kinda hard with arms full of bags, but i had to use it a couple times myself.
Mine started doing this and has been for a bit. I read somewhere that the contacts need to be pried up some. When you remove your battery, there's suppose to be 4 pins (contacts) and they need to be pried up a little bit so there's better contact with the battery, try that and see if it works better.