I have a problem with my Medalist and am looking for suggestions as to what to check. Some days it will go and some days it won't move. Sometime it goes to the garden and then will not move. There is no clicking when it doesn't go. Replaced the micro switch in the floor. Checked connections and all seem tight. Cleaned all battery post. Maybe I should take it to a repair shop but would like to avoid the cost if possible. Any help would be appreciated.