Let's say you roll a 2-7 as above.
The chances of that happening 2 more times in a row would be...
there is a 1/36 chance of rolling the 2 again 2 in a row.
there is also 36/1296 chance of rolling 7 2 more times in a row.
So the overall chance of getting 2-7 twice more in a row after it comes up the first time is 1/36 * 36/1296 = 36/46656
(that's 1/1296)
the odds of getting a 2-12 are smaller
still 1/36 of getting that 2 again 2 times in a row, but
there is only a 1/36 chance of getting that 12 to come up again once...or 1/1296 of it coming up twice after the initial roll.
Therefore the chance of rolling 2-12 twice more after it comes up once is only 1/46656.
if you take all rolls that start with 2, I calculate you have a 146/46656 chance of getting 3 in a row, or roughly
1/320 chance.
you also have similar odds of 3 in a row for each of the other 5 first numbers that can come up.
So, my take on it is regardless of the first number rolled, overall your chances of getting 3 in a row being the same is roughly 1/320.
My math may be faulty, but with a minimum of 55 rolls a game and 162 games played there should be 3 in a row of some kind occurring in a game you play at least 27 times a season.