Best answer by JackJ
Certain functions are quite different for different brands. Make sure that the Google calendar does not have any power intensive prompt enabled.
You can do that from phone manager/battery settings > (Make sure power saving mode is not enabled, since it can disable sync for your apps), open Launch > Look for the calendar and make sure that the tick next to it is not enabled, when you disable it a window will pop up with three options, select all three of those and you're set to go.
This might not change the way it functions, but it will eliminate any issues caused by the power saving process.
Let us know if this helped! Cheers!