Pull the SD card and try again. Doing the reset will enable all of the maps by default. My Montana will hang sometimes while loading maps. OSM maps make this worse since they seem to have more detail in them. I always try and run the minimum number of maps and disable any that are not necessary for my current trip. BWOE, on my current ride (Germany, Czech, Poland, Ukraine, Russia, Kazakhstan, Mongolia) I started with a separate map for each country and only enable the map for our current destination. Once done with a country I deleted that map from the SD card. Also, you can / should check your maps with JaVaWa for issues.