The time base adjustment on my Rigol DS1052E scope was getting wonky, and unusable at below freezing temperatures. I took the front cover off to access the encoder which generated the signal for the time base adjustment. I did not unsolder the encoder from the circuit board but worked some DeOxit into two small gaps that were there on the case of the encoder and then turned the encoder shaft many times to give the DeOxit a chance to work on the traces inside the encoder.
Put the scope back together and the encoder is working well now.
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