Trouble in WIFI connecting to Blynk

first of al sorry for my English. :wink:
I have some problem with connecting my ESP8266 NODEMCU via WiFi.
the same sketch (example sketches, nothing special) sometimes connects, sometimes doesn’t, and when it doesn’t connect, after about 4 minutes, the Serial Monitor tells me: ‘Connecting to’
I have changed “Blynk.begin(auth, ssid, pass);” into “Blynk.begin(auth, ssid, pass,, 8080”);" but nothing change in its random connecting.
Also I reset the router, the ESP8266 shield but the connection to Blynk remain accidental.
In this way it is unreliable to make me decide to purchase one of your plans.
Can you give me some help or advice?
Thank you for your attention.
Have a nice day.

void loop()

Posting code may help.

That’s a bad move.

The word “shield” in this sentence worries me. Are you using. NodeMCU as a WiFi modem for some other board?

Posting the sketch you are using, and your serial monitor output when things go wrong might help.

I’d also check that it’s not a power issue caused by a poor quality USB cable, an issue with whatever you are using to power the board, or a faulty board (usually the get hot when there’s an issue).