Left turn signal stays on.

I own a Dodge Caravan, 2000, automatic. Have been having an issue with the left turn signal. Happens most often when it is very warm outside. When using the left turn signal, it will stop blinking, the left rear light gets brighter, the left front light goes off. I have to play with the lever to get the signal to go off. I have replaced the front and rear turn signal lights and the fuse. Still happens. I have noticed that the dash lights will flicker every so often.
Any ideas what I can do next?

Thanks in advance,

Mel