Network can't handle all the traffic

While they have quite the selection of things to watch, it doesn't help much if the content is unwatchable. This happens during certain times what I suppose would be their "peak" period. Basically every Sunday evening from around 7 or 8 pm and now tonight for some reason. Tried watching an episode of Big Bang Theory through my smart TV and it kept "buffering".

I'm running a 100Mbps fibre connection and even tried switching my ISP (I have accounts with Vox and Webafrica) and both had the same result. A quick speedtest show my ping is 7ms and download speed is 95Mbps and I'm able to watch Youtube videos at 1080p while downloading files but I can't watch Showmax at 720 resolution with a dedicated connection.

If they want to market themselves as a video on demand service, they should at least ensure that they can handle the traffic.