H1 suddenly freezing every few mins

hi, I've had a h1 for the last couple of years running a cable sub, I've never really had any issues with it before up until this last couple of weeks. Watching anything on it is unbearable, the picture freezes every couple of minutes.

Ive contacted the person who I get my sub from he said the line is okay, I've rebooted the internet and checked all connections to no avail. Has anybody else been experiencing issues? Anybody know anything I could try to resolve it? It's freezing on all channels as far as I know.
 
I contacted my internet provider who said there is known issues I the area so im hoping it's that, I'll wait til that's resolved then try a test line if it's not fixed. Thanks for your help
 
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