Resulution of micros() in nano33 iot

[Robgroen]

Experience that when practicing communication through wifi, the micros() resolution changes from 1us to 1.5us per tick. Anyone suggestions here what could be the issue ?

[sonofcy]

Not enough info

[Robgroen]

I use the micros() in a timing loop to make 1ms ticks.

#include <WiFiNINA.h>
WiFiServer server(port)                ;
WiFiClient webserver                   ; 
WiFiUDP ntpUDP                         ;  

void setup() {
  while (status != WL_CONNECTED ) {  
       Serial.print ("Attempt to connect to SSID: ");  Serial.println(ssid);          
       status = WiFi.begin(ssid, pass) ;  
        Serial.print (" WiFi status = " ) ; Serial.println(WiFi.status()) ;                                                                                                                                                
       delay (100) ;  
}
server.begin();  
}
void loop() {

.....
 webserver = server.available(); 
 if (webserver) {   
.....
} 

As soon as webserver is true the micros() time tick changes from 1 to 1.5 us.