Syclemom, thanks for the update. I still see a trend here that BRP needs to address.
Last Friday I re-installed the parking brake cable on an RT with 10k miles on it. I also adjusted the cable (took up the slack). Three days later it came off again (3rd time).
Yesterday while installing accessories on a new identical RT with only 73 miles on it, I noticed the parking brake activation was much faster...the cable "stroke" was much shorter than the 10k mile RT. This tells me that, even after adjustment, the 10k bike cable still has too much stretch in it, allowing it to pop off the front pulley.
Rather than install one of the various inventive fixes posted on SpyderLovers, I advised the 10k mile Spyder owner to take his bike to his dealer, as its still under warranty. BRP needs to know this is happening.