During my trip to Toronto last week, I suddenly found my keyless remote worked very well. It had stopped work for 2 weeks and I checked the FOB on the frequency FM 94.9, at that time it did not work. Now I check it again and it works very well.
I think something in my key is not stable. Sometimes work, sometimes no. Anyway it is a 96 lexus, I guess some parts is close to their life limit. Just like the high beam light on my board, some times work some times no. Except these two small problems, my car is pretty good.