How is the Box Setup, as in how are you getting the channels populated? Script or Plugin?
On this Older Box for IPTV, I would recommend the Extreme TV Plugin from your Supplier, ASK if not got.
This works fine on the older box i find, especially the 2s box.
What connection have you got for the Tinternet, Fibre or Broadband? Speed wise?
Direct connection to Router, Homeplugs, Wireless?