Why would various TomToms ranging from Go 720-930 installed with Europe truck work for months on end then, when left unused for 2-3 weeks loop on the start screen when used again. Does anybody know a solution to this problem or am I missing something, i.e would TTgo.bif, TTgo.bak and TTgo.original present correct numbers to TomTom Home as well as preventing this problem? Thanks in advance all help is much appreciated.