Buffering on ethernet

Hello. I am hoping someone can give me some suggestions. I have Kodi installed on a Sony Vaio laptop. Other than antivirus and a few other small programs, Kodi is the only program that is running; I use the laptop strictly for a media center as I have it connected to my TV via hdmi. I have the laptop connected directly to my router with an Ethernet cable. I figured if I connected it directly as opposed to using wireless it would help with the buffering. HA! I thought wrong. Despite having it connected directly to the router, it is still buffering and down right stopping. I have a paid subscription to an IPTV service. They have excellent customer service and are very quick to let their customers know of any issues. I have done all the tweeks I can find but it is still doing it. I have comcast and I went into the router settings. It said my speed connected to Ethernet port 2 was 1000mbs. I also did a wireless speed test. The results were: DL 27.46, UL 5.73 RAM 2265 Can someone please give me some suggestion. Thank you very much.