I have a 2-tuner Tablo 4 that has suddenly decided that it can only use 1 tuner. I have had this Tablo 4 since they came out and it has given great service so I am not averse to buying another if necessary. Before I do I wanted to check if there is anything I can do to diagnose and, hopefully, fix the problem. I did power-cycle the Tablo without improving the situation.