I know this is an old ass thread, but I just picked up a used 06 5 sport and noticed this problem intermittently. Just found out it's most likely because I have a power inverter plugged into the 12v outlet. Just in case anyone else has this problem...
I just picked up a used 06 Mazda5 and I'm having the same problem. I'll have to unplug my inverter to see if that fixes it. I never noticed the problem in my 07 Speed3 when I used an inverter in it.
Well...a search for 'key' didn't bring anything up. I have 2 of the switchblade key fobs from my 06 Mazda5 that was totalled. Does anyone know if there's a way to program these key fobs to work with my 07 MS3?