Twice in the past two days the check light has come on saying "Brake light circuit failure." I had seen "bulb" failure before, but not anything involving circuit. Anyway, I took a look and found a tail light, not a brake light, was out, and replaced it. Message disappeared, I drive around just fine. Today it comes on again, and I go to the same light I changed yesterday, took it out of its socket, reinserted it, and again error message disappears. Any idea what's going on?