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If you put the tubes on a tester let them sit for a while and see if they change readings and also at this time check for shorts.
When the set goes out are the filiments still lit?
My stab at it
Thermistor going open once it warms.
Sand resistor goes open when warm.
Weak solder joint in a area that has higher current or high heat.
The way you described the flickering I wonder if you're losing horizontal oscillation, and in turn losing horizontal output, HV and B+boost.
I would start it back up and see if the filiments go out, and if they stay lit move on to the horizontal section.
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