Hello, I am a homeowner who currently owns an Ariens 46 inch riding lawn mower. The lawn mower is practically new, however we have had substantial issues with this rider. I should mention we have had numerous riders in the past years....Currently we have a Kubota Tractor with the accessories about 8 years old, a John Deere that we have owned for about 10 years. We have had troubles with the transmission in this mower, we have been told by the repair shop they have now put in two transmissions, as well as replaced a spindle. This, with maybe 20 hours on this machine, max. What are we encountering here? We have never had this many issues with anything purchased, I believe the mower, still does not seem to be running correctly. There is extreme vibration just sitting still. When engaged, the vibration seemed to decrease? Any help or insight would be appreciated. What is going on with this mower???? Thanks, Susan PS the model is A22A46...