I use NanoHttpd in Android to provide web pages to the browser, but I have encountered a strange problem recently.

Most of the time, the client can get the web page from the browser, but sometimes the connection is refused or the connection times out. At this time, I used another computer but could still get the web page. The computer with the original problem returned to normal after a while.

I only operated it under LAN and confirmed that the IP and network were running normally. Is there any possibility of causing this problem?