Cooling the VIC

I was wondering if anyone here has any additional hardware to help keep their VIC cool? When my C64R is powered on for an extended time (>24 hours), the image starts to lose stability with a lot of horizontal jittering. I want to do some more testing, but I think this is related to the temperature of the VIC, as it gets quite hot over time.

The issue is that the VIC is half obscured beneath the keyboard, so I don't think I can fit a heatsink on top of it. Is this something that anyone else has looked into before?

Thanks, I'll go ahead and try this. I hope to get to it this week, but I'm traveling soon so I may not get to it until the following week. I'll let you know my results.