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still shedding season
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That happens to me sometimes too - just grab the thumbscrew and you'll probably find that it's looser than you thought.
 

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Frame flex

jlandry said:
I'm riding a 8 speed Shimano der. with downtube shifters.
Travel adjustment is set up well, but when I'm cranking hard on a climb in the biggest cog, the derailleur shifts by itself to the next gear.:mad:

What gives?
In addition to the "loose levers" suggested by others, a flexy frame will cause the shifter cable to go slack/tight enough to shift to the next cog.
 
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