• I have no knowledge in these things, but suddenly the bike will not shift to bigger cogs on the cassette - stops in the middle of the cassette, when I'm trying to shift to bigger cogs.

    Dura Ace di2

  • Upper/lower limit screws set properly?

  • Check connections, then check connections...then re-check connections. Also asking the obvious. battery charged?
    Loose wires was one of the most common things I encountered. Either bar tape too tight, or too loose.

  • Have you tried turning it off and turning it back on again?

  • I have no knowledge in these things.

    Check battery charges, check the status on the junction box under stem, and if nothing, get it diagnostic.

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