[Elecraft] Thermal Stress in K2, K3 and I guess KX3

[John]

All,

Has anyone seen any degradation or temporary non-operation in the QRP 
versions of the K2 or K3 while operating in hot conditions?  Symptoms 
might include:

- gradual loss in output power
- gradual increase in output power
- controls stop working due to some processor lockup
- unexpected receiver bandwidth changes
- frequency drift (although what doesn't drift a little)
- any other change that returns to normal upon return to normal temps

This question works the other way too.  Has anyone seen the above during 
very cold operation?

As for the KX3, has the thermal analysis highlighted any stress point(s)?

Thanks.

John, kx4o