As of today, Nintendo has pushed out a minor firmware update in the form of version 7.0.1. According to the patch notes, only one thing has been changed, which is a fix for Pokémon Let’s Go. Slight connection issues have been resolved when connecting Let’s Go to Pokemon Go, and of course, the expected general stability updates are included.
Resolved an issue where the Pokémon: Let's Go, Pikachu! and Pokémon: Let's Go, Eevee! games cannot reconnect to the Pokémon GO app if the game software was closed after pairing with the app.