flasher

New Buick owner here: 2000 Park Ave. Left turn signal blinks real slow, right side is normal. Both sides blink normal when the hazard lights are on. Sometimes the light on the dash for the left turn signal gets stuck on (solid, not blinking) after a turn and I gotta lightly jimmy the lever to...

So, not all of those are related, obviously, but I had a few questions so I figured I'd throw them all in the title. My turn signal flasher seems to be going... normal speed for a while, then it seems to hang up and flash slow and then back to normal speed, so I was going to replace it. Anyone...