I've had a Humax PVR for a few months now and am generally very happy with it. However it has a consistent problem which remains after this w/e's software update. After switching on the box from standby the picture and sound is displayed / played clearly but then after about 20 seconds the signal is corrupted with frozen video and digital artefact (like a poor DAB signal) on the sound. This lasts about 20 seconds and then the picture and sound return to perfect quality. This happens every time the box is turned on. It blights the start of every recording I've made. I have a top quality signal from a DTV aerial and am within 4 miles of Crystal Palace transmitter. The box does not appear to have any other problems. Before I contact Humax, has anybody else here experienced this or a similar problem?