Does anyone have information that would help determine the percentage of Prius that have experienced the software or computer problems described on these chat groups? I am considering purchase of an 05 package 4 Prius and I tend to keep cars 8 to 12 years (15 now on my current Accord and just beginning to encounter unscheduled maintainence). I have read numerous posts of failures requiring a tow truck and software reload. More than 1 of those events in 10 years would be unacceptable. Any information out there to indicate if this is happening to 1% of the vehicles, far fewer, or more?