What level of heat must a satellite TV LNB be able to withstand?

[Greybeard]

What level of heat must a satellite TV LNB be able to withstand?

In the blazing sun I measured a temperature of 60°C (140°F) on the outside of the LNB housing using an IR thermometer.
Many transponders between 11836 and 12610MHz (both H and V polarizations) are cutting out.
When I pour cold water (21°C/70°F) over it, reception on those transponders is restored (tested repeatedly).
Yesterday, I temporarily wrapped aluminum foil around it to prevent the LNB from heating up so much in the sun, but the foil blew away during a thunderstorm last night.
Consequently, the signal loss recurred this afternoon.

Questions:
Does it indicate a defect, or is it somehow normal?
If I buy a new Quattro LNB, what should I look out for?
Also, is the alignment—both axial rotation and shift relative to the dish's focal point—difficult or critical (I don't have any satellite measuring equipment)?
Are there markings on the LNB housing and the mount to assist with this?
Can I open the old LNB without throwing off the tuning?

[CapLeaker]

That is normal. There used to be a German dude in Brazil and wanted to watch German TV from the Astra satellites. He was barely able to do that, but not 24/7 as I recall. He did try cooling the LNB and got better signal results.

So you need more gain and less noise. Either your dish and LNB needs to be realigned, a better LNB or a bigger dish.

[stj]

interesting,
isnt that frequency the switching point between low and high band that is done by modulating the supply voltage a bit with a specific frequency?

i used to be in the sat reciever business a long time ago and i remember when astra started going toward 12GHz we started using a dual-frequency system switched by modulating the LNB voltage by around 1v at a specific frequency.
this was not effected by the switching between 14 and 18v