What drive did you use with your swap? And what software did you use to install the software?
People are reporting problems with WD10EVVS drives manufactured on or after December 20.
If you used Mfslive or InstantCake with a drive larger than 1TB, your TiVo will reboot after five minutes every time. Only WinMFS produces a compatible install with drives larger than 1TB, and only when you follow the instructions in the FAQ