I have an hr 20 which is locking up for 15-20 second spans during replay, whether just buffered live tv or recorded shows. It is very annoying. The whole box locks with this happens, you can't do anything at all until it decides to unfreeze. I'm shocked to find that there is no non-destructive way to test/fix this issue. I called directv and they said the only option is to reformat and cross my fingers that it'll fix it. Then and ONLY then would they replace the unit. I also find it lame that there is not way to transfer the existing shows to an external drive. I would buy en esata drive and transfer them over and do the reformat if this were possible. Any other options out there? Anyone else experiencing this?