Jerky playback issue 17.3

Hi. I am a new Kodi user, and I heard good thing about it so I installed 17.3 on my Windows 7 sp1 64bit laptop and run it on a 2nd monitor running at 3840×2160.

I have a GTX980m Nvidia card, Intel i7-6820HK processor and 32g ram.

I just ran speedtest.net and my bandwidth is currently 53.94mps down and 17.82 up.

Every time I try to play anything I get perfect sound but the picture keeps jerking about every half a second and wherever I visit I cannot get it to play smoothly at all, be it live or pre-recorded. I have tried looking around for various suggestions as to how to solve this problem but have not had any luck so far.

I have a great system and bandwidth so why can I not get a single thing to play smoothly? It also affects the mouse movement on the second monitor when I move it there as it also jerks when I move it across the screen.

Any help will be much appreciated.

Thanks in advance.