I have the older, 2-tuner TiVo and my Tuning Adapter also poops out periodically. I have the _F.1601 version also.
Yes, the Techs have been here several times, variously liking and not liking the signal, adding, deleting, changing Amps, etc.
And, of course, the only way that you know that the TA has crashed is when you try to view your recording and find that there was no video signal. The light on the TA stays on through thick and thin......
Cox: Please find a working solution. Thanks!