Was it just a brief power interruption? I.e. anything else mains powered flicker too?
41degC out the vents is fine, assuming that there are no individual hot spots on the components. Typical semiconductors will operate up to over 100degC, but generally will be specified to operate around about 60degC
Early plasma and LED tellys were rather in-efficient, as they stuggled with the technology to get them bright enough. That mean’t the pixel drive currents were high and they produced lots of heat as a biproduct of the light output.
If it were a pure thermal trip cutting in, then i would expect it to be repeatable