Your IP could be getting blocked by our Web Application Firewall because you are sending SQL injection code to our filter3.asp API.  Some examples:

• siteID=561&orderby=sleeps_prop&availSearch=1&sleeps=0&datevar=1&numbernights=%2f%2a%2a%2fcOnVeRt%28int%2c%28char%2833%

29%2bchar%28126%29%2bchar%2833%29%2b%28char%2865%29%2bchar%2866%29%2bchar%2867%29%&region=0&startdate=23-12-2016&splitPage=200

• siteID=561&orderby=sleeps_prop&availSearch=1&sleeps=0&datevar=1&numbernights=3&&BeNChMaRK%282999999%2cMD5%28

NOW%28%29%29%29=&region=0&startdate=23-12-2016&no_price_err=1&splitPage=200

In order to fix this your web developer will need to sanitise the data before sending requests to the SuperControl API.