There was another Rogers update pushed to the Note 5 on Oct 27th. It came with the October security patch and might have had other improvements as well, maybe on battery life so try downloading it and see if it helps.
Also, I know people earlier in this conversation said marshmallow was never pushed to their phones back in May/June (I was one of them) and didn't want to load another carriers's update but this update was pushed OTA so if you still don't have marshmallow, you might get it now!