self shifting gears problem

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Short of time so not done a search for this....

Been out for a ride this morning and whilst on my middle front cog the 3rd and 4th gears on the back cog are shifting between themselves - mainly from the lower gear to the higher gear.
I was having a problem generally with the gears a last week and took it back to Decathlon where it was sorted out nicely.
Done about 60 mile since then. Any ideas? (Its a new bike)
 
Short of time so not done a search for this....

Been out for a ride this morning and whilst on my middle front cog the 3rd and 4th gears on the back cog are shifting between themselves - mainly from the lower gear to the higher gear.
I was having a problem generally with the gears a last week and took it back to Decathlon where it was sorted out nicely.
Done about 60 mile since then. Any ideas? (Its a new bike)

Give the cable adjuster on the rear shifter\mech a quarter turn in one direction and see if it improves things. If it makes it worse, turn in the other direction half a turn :rolleyes:
 
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