Turn signal question

[astat1]

I have a 70 Coronet. The turn signals work for about 12 blinks then stay on. The emergencies function fine. The signals work if you manually engage the lever up/down. The signals work again for the same sequence if left alone 10-15 seconds. Does this sound like a flasher, switch or a grounding issue? Thanks

[Winged 1]

 
IMO, it sounds like the round unit in the dash is getting ready to go bye bye. $4 bucks at the auto store should have it fixed.
Just my  ,
Eric