This recently started

Turn key- get normal lites/GP lites/ etc. Go to crank-- NOTHING - as if battery is dead...

Battery is 12.5 v

Happens several times over 15 minutes--

then randomly starts
also-- weird- same as above-- zero crank-- then as i am returning keyfob to OFF-- halfway on return-- it cranks and starts

also- has happened - were all of the above-- cranks/starts on return-- then when i return key to OFF position-- car stays running???

ANY IDEAS????