I have a issue with my Marlin 7 (2022). It has a Shimano Deore M5120 rear derailleur.
When the bike is on the bike stand the bike shifts perfectly. When I'm riding the bike the bike shifts fine until 8 to 10 gears then will change randomly.
I have made sure back wheel is not loose and the clutch is engaged on the derailleur.
I'm unsure how to adjust, when I can't replicate the issue on the stand.
Could any one give any tips.