I think you mean Altech UEC (Austech never made them)
Anyhow... if the LNB cap has deteriorated, then replace the LNB as it likely has moisture and/or dirt/spiders/insects in it.
Even if it's not the original cause of the problem, it will develop into one, so replace it regardless.
The temperature-related issue is possibly dry solder joints or faulty components, either in the LNB and/or the decoder.
The decoders are well known to develop such issues and replacement of some capacitors is the usual fix
explains the fix in detail, but if you are not skilled with a soldering iron and surface mount components, best leave it to someone who is.
Try replacing the LNB first.
You will need to adjust the new LNB skew (rotation in the holder) to maximise the signal quality.
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