My Matsui DTR1 keeps cutting out too, have another digibox works fine so cant be the signal. It also seems to have a faint electrical current when I touch it (but this is probably overheating...)
It should not have any electrical current when you touch it. Are you sure that it's not your carpets? The test is: without moving touch it a second time. If you still get a belt, it's the machine Not static.
If it is comparatively new, I'd take it back to Currys. (Matsui is a DSG own brand.) If not I'd bin it as budget boxes are not worth repairing.