Pulled into some shallows yesterday and hit a small stick on half power and as soon as I hit it the motor stopped working. I pulled it up to replace the shear pin and all was good. Leaving it out I noticed on full power it was trying to spin but it acted like it had no juice. So ten minutes after checking all connections and finding nothing wrong while I left it on continuous and it started working again. Then an hour later I had weeds around the prop so I turned it around and on full power to blow the weeds off and it spun maybe one turn and died again. Pulled the weeds off and gave it 5 minutes and it started working again......anybody have any ideas ?