网站在单一网络上崩溃,但在其他地方都有效

Can a old version of jquery (specifically a javascript auto refresh code) crash a website for a single user/local network?

I have a small/simple MySQL database with PHP coded site to insert and retrieve data for internal (non-public) use. It was developed over 4 years ago and still uses jquery-1.2.6.min.js and have had no problems until the past month. Now the site is very random on the operation but only affects the local networks the user I developed it for. It is not a browser crash such as when it goes down the site is unavailable on any computer in the network. Switch to a hotspot or a different building and all works as designed.

I don’t have any reason to think it is website or hosting problem (have talked to hosting support 3 times) but I am trying to cover my bases as the network engineers and ISP tech support are all scratching their heads.

I have used two instances of an auto refresh script 1) to show current time to the user and 2) to refresh the screen with new database content every 15 seconds.

An example on one of the two refresh scripts:

<script type=“text/javascript”>    
function load_content({ $(‘#db_content’).load(‘ac_data.php’).hide().show();} 
setInterval(‘load_content()’, 15000);

<div id=“db_content”>
<?php require ‘ac_data.php’;?
</div>

Is there any remote chance the code could be to blame since the site has not been updated since original development? I am merely looking for ammo to put the ball back in the network teams court but if there is any chance my code could cause a hang up then I would like to be able to fix it.