Need some help. Got a 2007 rancher 4x4 es. Wouldn t shift up only down

Need some help. Got a 2007 rancher 4x4 es. Wouldn't shift up, only down. Bought new shift motor and put it on, worked fine for a day, next day same thing wouldn't shift up, took it off and put it back on and works fine again. Rode it for about an hr today . What could it be?

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  • $25 angle sensor.