2006 Head/tail lights intermittently flash for no reason?

Don't know if this has been an issue for anyone else, but the past few days I have notice my head and tail lights will flash as though I hit the unlock button on my key chain fob. I first notice it a couple of days ago when I was putting some dishes in the sink and happened to notice them flash for no reason. My wife was upstairs and the keys were a few feet away from me, so I know she wasn't messing with me. I went outside to make sure the doors were locked, which they were. It happened again this morning when I was pouring coffee. Any thoughts? I was thinking this might be a built in warning system to let me know the battery was dying, but that's just a guess. It's the original battery with 122k miles on it. Any information would be helpful. Thanks in advance.
-UncleKev

 

key fob is being pressed or it has a circuit problem or stuck button

open it up check for mung