Export to YouTube does not always work.

As the title suggests, exporting to my Youtube channel via Media Encoder does not always work.
During the hours of the day everything works perfectly but from 8 pm to 8 am this function completely stops working for me.
Even staying connected to my account goolge in Media Encoder does not find me to select my channel and therefore consequently does not work for me.
I repeat to be clear:
From 8 pm until 8 am the export on my youtube channel is not possible via Media Encoder.
Have any of you encountered a similar problem?
There is a solution?
Thanks in advance.