Welcome to SegwayChat.
Have you read the User manual?
PDF version are available on the web if you do not have one.
The issue you defined sounds like the Speed Limiter has engaged.
This is a common issue for new riders.
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Also, you will get more responses to this type of " what is happening " question if you use the
General Discussions group
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Good Luck.
i2 Glider for 8+ years,
11,800+ miles