Yes, yes yes and yes again LOL
I do this as well. At first, I did not, I just cruised right on through decades in about three weeks. But now...UGH. It is a struggle. I inevitably get stuck at the 2's (262,252 etc.) I go up to the 5s for a minute and then woosh down to the 8's. It is annoying. I am not sure, I have to look into it a bit more, but I THINK that for me at least it seems to be that it around TOM that I get to the point where i should be going into a new decade, about every 5 weeks. So I always am in that sort of PMS/Post MS period. Make sense?
Whatever it is for you I feel ya.
Hang in there, hopefully you can find a trend that you can track and that will help with trying to "fix" the issue.