Dear Mr Topilin!
Firstable, congratulations for such a big success, to win half of the restaurants in the city as customers for your wifi systems. Unfortunately, your success is my grief, as that way I’m kind of forced to use your wifi systems everyday when I sit somewhere for a coffee. Really, it could be a more pleasant experience! So please let me briefly elaborate my grief and suggest some small fixes for the wifi system, that would make the life of especially your frequent end users much easier.