ESP8266EX board blynk code wifi error

After uploading the code to the esp8266ex board through the arduino IDE, there is a phenomenon that WIFI is connected and then disconnected and then repeated. What could be the problem?

#define BLYNK_PRINT Serial
#define BLYNK_AUTH_TOKEN "WHuAvVuhTxeY4Y4-Ejhd9MvadIBBIjHn"
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
char auth[] = "WHuAvVuhTxeY4Y4-Ejhd9MvadIBBIjHn";
char ssid[] = "olleh_WiFi_82B6";
char pass[] = "*************";
    void setup()
Blynk.begin(auth, ssid, pass, );
void loop()

It’s not a wifi issue but maybe a power failure issue.
Change 9600 bauds to 57600 bauds to see why the esp restart.

@remage please replace your screenshot with the actual text that you’ve copied from your serial monitor.
In you need to put triple backticks before and after the serial output and also before and after your code so that they display correctly.
Triple backticks look like this:

You also need to provide full details of the hardware you are using, and whether you have any peripherals connected to your board.

Details of the datastreams that you’ve set-up may also be useful (a screenshot will be fine for this).