Mine either. Something that worked with my sleep not automatically tracking was to not track it manually then it seems to reset itself and does it automatically again. Are your walks over 10 minutes long at a time? What about your settings for your walk tracking - is that set to the minimum (10 minutes) instead of the default of, I think, 30 minutes?
Have you had the Firmware update recently? If you have, it seems to take a few days/a week for it to automatically track again and during that time, resist the temptation to track your walks manually... keep a record outside the app (in Notepad or Word or whatever) but only log your food and liquid intake manually until it's stopped getting its knickers in a twist. When it finally starts logging things automatically again, you can, apparently (but I haven't tried it myself) you can go in and log things manually again.
It's annoying but necessary unfortunately.
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