connexion problem

I have been using blynk for a short time and I have a problem with the connection.
I have an Arduino UNO WiFi rev2 connected in wifi to my box (with WiFiNINA) and a Xiaomi REDMI NOTE 7 phone with ANDROID which drives the arduino. Everything works perfectly, but I have the impression that when I close BLYNK on my phone, the arduino also disconnects and it cannot reconnect when I turn on BLYNK on my phone … Why?

You “have the impression”, or you’ve proven that every single time you close the Blynk app the Uno disconnects?