Cummins engine dies and then !!!

on return from Bremen,Indiana on Nov.6th after travelling 225 miles and 15 miles from home the motorhome shutdown and after pulling off side of road after waiting about 20 min.was able to move up about 5 miles and then did this a couple of more times and then had to wait 10hrs before it would start again and allowed us to get to the Cummins Dealer 10miles away. Nothing showed up on their computer. After sitting for a day was able to start vehicle sometimes after 10-15 clicks of ignitition key and sometimes on 1st try and sometimes on 2-3-4 tries. Kept 2 day log of each attempt and would try every couple of hours and above were the results. Reaching out for any ideas of what may be the problem. Appreciate any feedback. Forgot to add that when vehicle died there was no power to dashlights when key was turned on. Would only start when key turned and lights come on. ECM and fuel pump ok.