I am trying to update maps on a Nuvi 2595. It either gets stuck on preparing for map update or starts and gets to 0.1% then the data rate keeps going down and the time to download goes up. Have tried all the fixes I see online - latest version of Express, new USB cable, chkdsk, remove and add device. It's not internet connection because I'm on 1.5 GB fibre. I have successfully updated this device a few years ago. Just can't do it now.