Spare Tire problems of the 2008 Toyota Prius

I purchased four continental 185 65 r15 tires for 2008 Toyota Prius and had them installed at a Nissan dealership on 10/24/2011with mileage 92526 due to curb strikes, I incurred two road hazard sidewall claims within 2 days of install; one bulbous section and one flat. Installation of warranty replacements occurred 11/08/11 at mileage 93335. Another curb strike sidewall warranty claim for third tire installed on 2/28/12 at mileage 98658. Fourth and final replacement of originally purchased tires yet to be processed/installed from curb strike road hazard on 4/9/12 at mileage 100289. Prior to purchase of continental tires, no road hazard has occurred with the vehicle on two other brands of tires. I had to purchase an extra oem spare tire due to the length of the warranty process and the number of occurrences. The last and final time, since I had not yet replaced my oem spare again(it hadn't been six weeks since the last replacement) I purchased a less-expensive brand and model, as each local continental dealer is unable to order this model of tire from their distributor and has to call continental for replacement directly. The second oem spare was unfit for driving.

The contact owns a 2008 Toyota Prius. While driving 10 mph, the front driver's side tire went flat. The contact replaced the tire with a spare. The vehicle then began experiencing numerous failures. The instrument panel gauges illuminated and the odometer began to fail. The dealer stated that it would take a few days to diagnose the cause of the failure. Days later, the mechanic explained that there was an issue with the computer system not recognizing the oversized tires. The mechanic placed the regular size tire back on the vehicle, which corrected the issue. The contact is concerned that the spare tire could cause dangerous driving conditions if it ever needed to be used again. The current and failure mileages were 14,500. Updated 11/14/08. Updated 11/18/08.