Mobile users get net::ERR_CONNECTION_RESET when trying to do a specific action on our in house hosted site - Ubuntu / Apache

Hello all,
    Users (including myself) have been getting the error of :net::ERR_CONNECTION_RESET: when trying to select an item that they searched for  (ajax loaded search results), but when they click on the item it takes them to an error screen. It was discovered first on an ipad using Safar on a 3g connection and they were not able to provide much information, so then I tried on my phone and got it as well (Android Marshmellow, using Chrome), so I connected my phone to my PC and enabled remote debugging, but only came across this really.

:Failed to load resource: net::ERR_CONNECTION_RESET

GET http://oursite.com/index.php/Site/Detail?wek=MSM501&cmp=%20AND%20IZCMP%20=%201 net::ERR_CONNECTION_RESET

http://oursite.com/index.php/Site/Detail?wek=MSM501&cmp=%20AND%20IZCMP%20=%201

If I put my phone on wifi, it seems to work just fine, but when I switch over to 4g LTE, it then does it again. My PC works fine, as does everyone elses here, but we have had 4 reports, (2 from sales people, 2 from customers). The rest of the site seems to be working fine, but it is only when actually selecting a product in a search field that uses ajax to create a list of matching items. That works fine, it is only when you actually click on one of the items it then does this.

Could it possibly be a server setting of some sort?

Thanks all