Frowny faced Segway pitched me off my ride today

[eniveld]

Well I guess I should have slowed down when serious (not frowny) face showed up. I was descending a fairly big hill - about 700 feet high - at about 4-5mph and I was going at what I thought was my downhill limit, when Segway seemed to get confused.

It seemed Segway could not figure out how to level itself. It kept slowing me down until I was going backwards, uphill. I stepped off, reset things, and got back on again. This time Segway seemed to purposefully pitch me forward right over the thing and I went tumbling down hill. Thankful for my helmet, wishing I was wearing gloves. I was not on a particularly steep hill, I was going only 2-3 mph, and it just couldn't figure out which way was up.

Has anyone run into a situation where you just could not go downhill? Or the unit just pitched you forward? Or got confused about which way was level? It's kind of made me a bit less confident of going faster until I figure this out.

-- From a first time poster an Segway newbie.