2011 Nissan Sentra Q&A

2011 Nissan Sentra Question: radio not functioning right 10 minutes then works fine ,when you turn off car sa

when car is turned off radio cannot be controled for about ,10 minutes then works finewhen car is turned off same thing again with radio -
Answer 1
When it comes back on, are all the preset (favorte stations) memory lost? Clock, if equiped, show the wrong time? Any warranty left? -