tendons

ok., now with 12000 miles the tpm has gone out again for a total of 15 times, or so. but the last time was four months ago. I always do the same thing.Hit the r button say yes when it asks if I want to check tire pressure, watch as it says tire pressure monitor being activated and then, then it goes back to the screen which says tire pressure monitor will be activated after driving a few minutes or miles. And in the past it has done it, although at times it took two or three days and it suddenly showed the pressures.
anyone else? is there a software update? Whenever I push the reset button it shows the tpm to be off.
I've taken it in, they've reset it, without difficulty and it's o.k. for two-four weeks and then it goes out again.