Run History Missing from Nano

Question

Greetings!
So here's the skinny. I have a 1st Gen Nano - have had absolutely no issues with it, or my Nike+ stuff, until a few days ago.
On Saturday, the 24th, I was running, and my Nano had a total battery loss/shut down. It had been giving me (I thought) full battery indicators all week, so I was a bit surprised to check it and find it black/off/won't start back up. But, I connected it to my iBook, let it charge up a bit, fired it up, it synced, the run data it had captured before the battery died was there, everything seemed fine and peachy.
Then Monday I run, and sync, and the run posts to Nike+, so it was obviously saved/captured by my Nano. But when I look at the Nike+ Info tab on iTunes, with my Nano still connected, it has no information for "Latest Workout", and the run totals are now off by one run. Same thing happens for my run Tuesday. The Nano obviously saved my run - because when I synced up it sent the info to Nike+. But nothing shows up in "Latest Workout", and my run totals were then off by 2 runs.
After seeing this I start poking around on the Nano itself, and find it won't load my run history past run #107 - which was in July of 2008. At that point I was up to 205 runs. No matter what I do to reset the Nano, it simply won't load run history past 107.
After doing a reset though, I ran today. Again, the run was saved and sent to Nike+'s website. Only today my run totals went up by one. There is still no info in "Latest Workout", and my run totals are off, but at least today it showed signs of life by upping my totals by one. The run totals on my Nano also reflect the run from today, but are missing the runs from Mon/Tues, and it still won't load any history past run 107.
I'm hoping someone here can shine some light on what is going on. I have a feeling the power failure had something to do with it - but doing a reset isn't fixing the issue. All my iTunes/Nano software is up to date, and was up to date before I noticed this issue. I'm doing resets by holding down "Menu" and the center button. I'm not sure if there is any other sort of reset I can do. I'd really rather not restore the iPod, since I know I'll then lose all my run history data, and that's the whole point - I'm trying to recover that! Plus ... I want it to be accurate again! Unless there is some way to save the history file, try restoring my Nano, and then reloading the history file ... seeing if that helps.
I'm very glad to not be actually losing runs - everything is still being sent to Nike+ - which is where it's most important for it to be tracked anyway. But having the accurate history on my Nano was a big deal to me ... so I'd really like to fix this up so I have all my run data at my fingertips again.
Thanks!
~ Rebecca ~

Answer 1

NEW INFO
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I have changed iPods 3 times in the last month, and forgot to transfer the calibration information via inVisibles. I was a bit mad losing that info, but eh! Such is life.
Today I just noticed that my last calibration dating back from August 07 was on my new iPod! So it seems that Nike+ or iTunes is actually keeping a record of it, and transfers it to the new iPod when we update our hardware!!!
So basically, if you just want to avoid losing your calibration information when you upgrade, it's now done automatically. Thanks Apple!