Yes, I've been having the same problem with mine. After taking it in about 4-5 times for this, and they'd say it's working fine, I finally discovered that it seemed to be interfering with my cell phone (or my cell phone GPS was interfering with my car?) Since then, I've been turning of my phone gps when driving and worked well for awhile. Now lately I'm having the same issues again. Seems to be when I need it the most, TomTom can't find GPS signal, no matter what I do to the phone. Taking it in this weekend, I will request this update, hopefully it will help.
Thank You