2015 Tucson, radio/clock/calendar
 

Clock needed to be reset nearly every time the engine was started. Not sure this is a current issue, after checking(or unchecking) D.S.T.
When resetting the clock, I also noticed, a date: 14Apr2011. I can find no information on this! Was this the mfg. date of the radio?
Inquiring minds want to know!

Check the Fuse Box under the Dash. There is a Memory Shunt that is supposed to be pushed in. Should be at the Top of the fuse panel. Page 7-65 in the Owners Manual