I have 2 TiVo HDs (652s). One reboots or freezes multiple times a day. This has gotten steadily worse since I got it in Dec 2103, when it would reboot once every couple months which I thought that was just normal activity. I've replaced the hard drive with 2 other drives, one new and one previously used in a cable DVR. I've swapped hard drives and power supplies (both are 3Y supplies) between TiVos. I've replaced all caps except the large one in both supplies. I've even swapped front panel displays and fans, and loaded fresh image on the hard drive. No change to either TiVo's behavior. TiVo 1 reboots and freezes multiple times daily and TiVo 2 never does. Any ideas on what's wrong and how to fix it?