Has anybody used a HDMI splitter with their box?

I have a 1 to 4 HDMI technomate splitter with 1x 10m - 1x7.5m - 1x2m HDMI lead connected.

Every so often, maybe 20 seconds, maybe 5 minutes the signal drops out on either of the televisions the aforementioned leads are connected to. I have tried multiple leads and even 4 different splitter albiet from the same manufacturer.

Could this be an issue with the output of the box, maybe the resolution, even though I've tried a few different options?