On Sat, 15 Aug 2020 01:56:12 -0700 (PDT), polygonum_on_google wrote:

Have you cleaned the back? All the "radiator" fins, etc.

Are you sure it has not lost some gas?

Have you considered placing a very modest fan to encourage better
airflow?

What climate class is it and where is it located?

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Cheers
Dave.