I am using 30 second scan. I got used to watching the scan to see when the show returns from commercial.
The first unit was a Premiere XL where I was using a universal remote.
I just received a RoamioPro and had the same thing happen using the included remote.
It doesn't happen often, but when it does, it is a pain to try and find where you were.
Happened during a football game recording and spoiled the next 2 quarters due to the jump.
I do push the button quickly 6 times when the commercial starts and I have tried to slow down my presses to see if that helps.