For the past month or two, many DIRECTV TiVo R10 users have found their TiVos rebooting and freezing randomly. We have notified DIRECTV about the problem and they tell us that TiVo is working on the issue. Based on feedback from some very astute customers, we have come to learn that BBC America (channel 264) will cause your R10 to freeze or reboot very quickly, so you might want to cancel your BBCA season passes (sorry, Orphan Black fans) until the problem is resolved.
UPDATE, 7/15: Discovery Channel and possibly History Channel are also being impacted by this problem. DIRECTV engineers have verified the problem and are pushing TiVo engineers to help get the issue resolved. We are cautiously optimistic.