Android box. KODI says working but nothing

Hi guys,
I’m a complete newbie to KODI, so have been learning as I go.
I have the Leelbox, and KODI V16. Jarvis. I’ve managed to install
All the addons I want to use, however here is my dilemma
I click on the stream I want to watch, it starts to open and the WORKING
Appears in the bottom right, it just stops and nothing happens.
Please help I’m slowly losing my patience
Thanks in advance
Ash