Pete KE9OA wrote:
I let the receiver run for about 15 minutes and the carrier injection
problem showed up in the form of the BFO frequency being drastically
shifted. I cooled the chip and normal operation of the receiver resumed.
After 2 more minutes when the chip heated up again, the problem surfaced
again. I cooled the chip once more, and once more, the receiver resumed
normal operation.

If you want a cheaper "freeze mist", use cans of "Dust Off" held upside
down. I believe they use the same chemical, but I get 4 12 oz. cans
of Dust Off for under $11 at Costco, while I haven't seen a 6 oz. can
of freeze mist for under $8 in 30 years.