2015 Prius C Suddenly Having Issue With Turn List Under Map Mode

When traveling I like having the Nav screen split in two with the map on the left and the turn list displaying upcoming turns on the right. I have always been able to due this until yesterday. Now I can click on map mpde and select the turn list and as always the map shows on the left and the turn list on the right HOWEVER this doesn't remain that way. After about 30 secs the turn list disappears and only a map shows. If I am listening to the audio system /XM radio then that info will be displayed in place of the turn list. HELP! I am traveling away from home and I really depend on the turn list. Thank you.