You can do something to help reduce the freezer's power consumption, in particular now you have moved to an upright model, by the number of times it is opened; that is try to manage visits so you get out or put things, say today and tomorrow's item s in the same visit or/and restock during a removal visit. Unlike chest units the cold air falls out. The power consumption changing can indicate it is not closed properly or the seal is aging, both issues become more sensitive with the upright models.
There could be issues with a decent WiFi network signal in a remote garden shed? In a similar challenging network signal case I have had to adopt a "powerline", network over mains connection. Despite warnings these can have issues on "spurs" [as opposed to "ring" mains}, mine works a treat with 50 metres of extension.